Release v175 (#1032 )

Fix inconsistent formatting in CHANGELOG.md (#1031 )
- Switches releases to always using H2 (`##`) rather than a mixture of H1s (meaning multiple H1s in the same document) and H2s. - Always refers to the versions as `vNNN` rather than sometimes without the `v` prefix. - Other formatting and typo fixes. @W-7905079@
2026-06-05 23:10:16 +00:00 · 2020-08-05 09:12:16 +01:00 · 2020-08-03 20:18:18 +01:00 · 2020-08-03 19:45:41 +01:00 · 2020-08-03 18:36:01 +01:00 · 2020-08-03 17:31:08 +01:00
170 changed files with 1911 additions and 23421 deletions
@@ -1 +1 @@
-* @heroku/languages
+* @heroku/languages
@@ -0,0 +1,17 @@
+name: Check Changelog
+
+on:
+  pull_request:
+    types: [opened, reopened, edited, synchronize]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    if: |
+      !contains(github.event.pull_request.body, '[skip changelog]') &&
+      !contains(github.event.pull_request.body, '[changelog skip]') &&
+      !contains(github.event.pull_request.body, '[skip ci]')
+    steps:
+      - uses: actions/checkout@v1
+      - name: Check that CHANGELOG is touched
+        run: git diff remotes/origin/${{ github.base_ref }} --name-only | grep CHANGELOG.md
@@ -7,3 +7,8 @@ repos/*

 #Venv
 buildpack/*
+
+builds/dockerenv.staging*
+builds/dockerenv.production
+
+test/scratch
@@ -0,0 +1,7 @@
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+    -   id: check-yaml
+    -   id: end-of-file-fixer
+    -   id: trailing-whitespace
@@ -1,39 +1,44 @@
-language: ruby
-dist: trusty
-sudo: required
-rvm:
- 2.4.4
-before_script:
-  - gem install bundler -v 1.16.2
-  - bundle exec rake hatchet:setup_travis
-before_install:
-  - sudo bash etc/ci-setup.sh
+language: minimal
+dist: bionic
+branches:
+  only:
+  - main
+
+script:
+  - make test STACK="${STACK}" TEST_CMD="${TEST_CMD}"
+
 jobs:
  include:
-  - stage: Bash linting (shellcheck)
-    sudo: false
-    before_install:
-    - wget -c https://goo.gl/ZzKHFv -O - | tar -xvJ -C /tmp/
-    - PATH="/tmp/shellcheck-latest:$PATH"
+  - name: Bash linting (shellcheck)
    script: make check
-  - stage: Stack Unit Tests
-    services: docker
-    env: STACK=heroku-18
-    script: "./tests.sh"
-  - stage: Stack Unit Tests
-    services: docker
-    env: STACK=heroku-16
-    script: "./tests.sh"
-  - stage: Stack Unit Tests
-    services: docker
-    env: STACK=cedar-14
-    script: "./tests.sh"
-  - stage: Hatchet Integration
-    script: "bundle exec rspec"
+  - name: Hatchet integration tests
+    if: env(TRAVIS_PULL_REQUEST_SLUG) = env(TRAVIS_REPO_SLUG)
+    language: ruby
+    rvm:
+      - 2.6.6
+    before_script:
+      - gem install bundler -v 1.16.2
+    script:
+      - bundle exec hatchet ci:setup
+      - PARALLEL_SPLIT_TEST_PROCESSES=11 bundle exec parallel_split_test spec/hatchet/
+
 env:
+  jobs:
+    - STACK=cedar-14 TEST_CMD=test/run-deps
+    - STACK=cedar-14 TEST_CMD=test/run-versions
+    - STACK=cedar-14 TEST_CMD=test/run-features
+
+    - STACK=heroku-16 TEST_CMD=test/run-deps
+    - STACK=heroku-16 TEST_CMD=test/run-versions
+    - STACK=heroku-16 TEST_CMD=test/run-features
+
+    - STACK=heroku-18 TEST_CMD=test/run-deps
+    - STACK=heroku-18 TEST_CMD=test/run-versions
+    - STACK=heroku-18 TEST_CMD=test/run-features
  global:
-  - HATCHET_RETRIES=3
-  - IS_RUNNING_ON_CI=true
-  - HATCHET_APP_LIMIT=5
-  - secure: yjtlPE5FbVxTKnjUy/tZUBgSEf4qADD3QOxtgziuid73S0U/1IEXlMGFULsQzIjtlHKmHeywZqpVVEpthIH4RuT7uoX1Pb7SSM/g0T8fT3VoEFbFK1uYl0oZQbUS4Klxv9tPiumj8if3m6ULEGIz1X0wZcMOC0tMLwVCnwmap0E=
-  - secure: ZeFTHWwnpIKE9nAqs88ocmiQh7bKce84lilGm5J23nf3N6V4wNyLwqlkvsM008WGBCaOg9AUx7ZunasT0ANsR5gLP3eV2UUg7ILdRgV2Gy13eNRFheC4PHdN92RqQ3aKoqlIv2K999xlhVjod0NzhkQQXB6PddfQINbuU7ks6As=
+    - HATCHET_RETRIES=3
+    - IS_RUNNING_ON_CI=true
+    - HATCHET_APP_LIMIT=80
+    - HATCHET_DEPLOY_STRATEGY=git
+    - secure: yjtlPE5FbVxTKnjUy/tZUBgSEf4qADD3QOxtgziuid73S0U/1IEXlMGFULsQzIjtlHKmHeywZqpVVEpthIH4RuT7uoX1Pb7SSM/g0T8fT3VoEFbFK1uYl0oZQbUS4Klxv9tPiumj8if3m6ULEGIz1X0wZcMOC0tMLwVCnwmap0E=
+    - secure: ZeFTHWwnpIKE9nAqs88ocmiQh7bKce84lilGm5J23nf3N6V4wNyLwqlkvsM008WGBCaOg9AUx7ZunasT0ANsR5gLP3eV2UUg7ILdRgV2Gy13eNRFheC4PHdN92RqQ3aKoqlIv2K999xlhVjod0NzhkQQXB6PddfQINbuU7ks6As=
@@ -1,76 +1,243 @@
 # Python Buildpack Changelog

-# 141 (2018-10-10)
+## Unreleased
+
+
+## v175 (2020-08-05)
+
+- Update pip from 20.0.2 to 20.1.1 for Python 2.7 and Python 3.5+ (#1030).
+- Update setuptools from 39.0.1 to: (#1024)
+  - 44.1.1 for Python 2.7
+  - 43.0.0 for Python 3.4
+  - 47.1.1 for Python 3.5+
+- Switch the `heroku-buildpack-python` repository default branch from `master` to `main` (#1029).
+
+## v174 (2020-07-30)
+
+- For repeat builds, also manage the installed versions of setuptools/wheel, rather than just that of pip (#1007).
+- Install an explicit version of wheel rather than the latest release at the time (#1007).
+- Output the installed version of pip, setuptools and wheel in the build log (#1007).
+- Errors installing pip/setuptools/wheel are now displayed in the build output and fail the build early (#1007).
+- Install pip using itself rather than `get-pip.py` (#1007).
+- Disable pip's version check + cache when installing pip/setuptools/wheel (#1007).
+- Install setuptools from PyPI rather than a vendored copy (#1007).
+- Reduce the number of environment variables exposed to `bin/{pre,post}_compile` and other subprocesses (#1011).
+
+## v173 (2020-07-21)
+
+- Python 3.8.5 is now available (CPython).
+
+## v172 (2020-07-17)
+
+- Python 3.8.4 is now available (CPython).
+
+## v171 (2020-07-07)
+
+- Python 3.6.11 and 3.7.8 are now available (CPython).
+
+## v170 (2020-05-19)
+
+- Python 2.7.18, 3.5.9, 3.7.7 and 3.8.3 are now available (CPython).
+- PyPy 2.7 and 3.6, version 7.3.1 are now available (Note: PyPy support is in beta).
+- Docs: Fix explanation of runtime.txt generation when using pipenv.
+- Bugfix: Correctly detect Python version when using a `python_version` of `3.8` in `Pipfile.lock`.
+
+## v169 (2020-04-22)
+
+- Add a Hatchet test for python 3.8.2
+- Set Code Owners to @heroku/langauges
+- Bugfix: Caching on subsequent redeploys
+- Update tests to support latest version of Python
+
+## v168 (2020-04-06)
+
+- Doc: Update Readme with version numbers
+- update Code Owners to include the Heroku Buildpack Maintainers team
+- Deprecation warning: `BUILD_WITH_GEO_LIBRARIES` is now deprecated. See warning for details.
+- Clean up build log output
+- Update Python versions in README to match docs
+- Django version detection fixed, link updated
+
+## v167 (2020-03-26)
+
+- Add failcase for cache busting
+- Bugfix: Clearing pip dependencies
+
+## v166 (2020-03-05)
+
+- Correct ftp to https in vendored file
+- Warn for Django 1.11 approaching EOL, provide link to roadmap
+
+## v165 (2020-02-27)
+
+- Python 3.8.2 now available.
+
+## v164 (2020-02-20)
+
+- Update requirements.txt builds to use Pip 20.0.2
+- Download get-pip.py to tmpdir instead of root dir
+
+## v163 (2019-12-23)
+
+- New pythons released:
+  Python 3.8.1, 3.7.6, 3.6.10 (CPython)
+  Beta Release: Pypy 2.7 and 3.6, version 7.2.0
+
+## v162 (2019-12-06)
+
+- Bug fix: fragile sqlite3 install
+
+## v161 (2019-12-2)
+
+- Bug fix: Sqlite3 version bump
+
+## v160 (2019-10-23)
+
+- Bugfix: Pipenv no longer installs twice in CI
+
+## v159 (2019-10-22)
+
+- Python 2.7.17 now available on Heroku 18 and 16.
+
+## v158 (2019-10-21)
+
+- Python 3.7.5 and 3.8.0 now available on Heroku 18 and 16.
+- Add support for Python 3.8 branch
+- Sqlite3 Update:
+  - Test Improvements
+- Add support for staging binary testing
+
+## v157 (2019-09-18)
+
+- Typo fixes
+
+## v156 (2019-09-12)
+
+- Python 3.6.9 and 3.7.4 now available.
+
+- Move get-pip utility to S3
+- Build utility and documentation updates
+- Bump Hatchet tests to point at new default python version.
+
+## v155 (2019-08-22)
+
+add docs and make target for heroku-18 bob builds
+
+## v154 (2019-07-17)
+
+Fix python 3.5.7 formula actually building 3.7.2
+
+## v153 (2019-06-21)
+
+Hotfix for broken heroku-16 deploys
+
+## v152 (2019-04-04)
+
+Python 3.7.3 now available.
+
+## v151 (2019-03-21)
+
+Python 3.5.7 and 3.4.10 now available on all Heroku stacks.
+
+## v150 (2019-03-13)
+
+Python 2.7.16 now available on all Heroku stacks.
+
+## v149 (2019-03-04)
+
+Hotfix for broken Cedar 14 deploys
+
+## v148 (2019-02-21)
+
+No user facing changes, improving internal metrics
+
+## v147 (2019-02-07)
+
+Python 3.7.2 and 3.6.8 now available on all Heroku stacks.
+
+## v146 (2018-11-11)
+
+Python 3.7.1, 3.6.7, 3.5.6 and 3.4.9 now available on all Heroku stacks.
+
+## v145 (2018-11-08)
+
+Testing and tooling expanded to better support new runtimes
+
+## v144 (2018-10-10)

 Switch to cautious upgrade for Pipenv install to ensure the pinned pip version
 is used with Pipenv

-# 140 (2018-10-09)
+## v143 (2018-10-09)

-Add support for detecting SLUGIFY_USES_TEXT_UNIDECODE, which is required to
+Add support for detecting `SLUGIFY_USES_TEXT_UNIDECODE`, which is required to
 install Apache Airflow version 1.10 or higher.

-# 139 (2018-10-08)
+## v142 (2018-10-08)

 Improvements to Python install messaging

-# 138 (2018-08-01)
+## v139, 140, 141
+
+No user-facing changes, documenting for version clarity
+
+## v138 (2018-08-01)

 Use stack image SQLite3 instead of vendoring

-# 137 (2018-07-17)
+## v137 (2018-07-17)

 Prevent 3.7.0 from appearing as unsupported in buildpack messaging.

-# 136 (2018-06-28)
+## v136 (2018-06-28)

 Upgrade to 3.6.6 and support 3.7.0 on all runtimes.

-# 135 (2018-05-29)
+## v135 (2018-05-29)

 Upgrade Pipenv to v2018.5.18.

-# 134 (2018-05-02)
+## v134 (2018-05-02)

 Default to 3.6.5, bugfixes.

-# 133
+## v133

 Fixes for Pip 10 release.

-# 132
+## v132

 Improve pip installation, with the release of v9.0.2.

-# 131
+## v131

 Fix bug with pip.

-# 130
+## v130

 Better upgrade strategy for pip.

-# 129
+## v129

 Don't upgrade pip (from v128).

-# 128
+## v128

 Upgrade pip, pin to Pipenv v11.8.2.

-# 127
+## v127

 Pin to Pipenv v11.7.1.

-# 126
+## v126

 Bugfixes.

-# 125
+## v125

 Bugfixes.

-# 124
+## v124

 Update buildpack to automatically install `[dev-packages]` during Heroku CI Pipenv builds.

@@ -79,101 +246,101 @@ Update buildpack to automatically install `[dev-packages]` during Heroku CI Pipe
 - No longer warn if there is no `Procfile`.
 - Update Pipenv's "3.6" runtime specifier to point to "3.6.4".

-# 123
+## v123

 Update gunicorn `init.d` script to allow overrides.

-# 122
+## v122

 Update default Python to v3.6.4.

-# 121
+## v121

 Update default Python to v3.6.3.

-# 120
+## v120

 Use `$ pipenv --deploy`.

-# 119
+## v119

 Improvements to Pipenv support, warning on unsupported Python versions.

 - We now warn when a user is not using latest 2.x or 3.x Python.
 - Heroku now supports `[requires]` `python_full_version` in addition to `python_version`.

-# 118
+## v118

 Improvements to Pipenv support.

-# 117
+## v117

 Bug fix.

-# 116
+## v116

 Vendoring improvements.

 - Geos libraries should work on Heroku-16 now.
 - The libffi/libmemcached vendoring step is now skipped on Heroku-16 (since they are installed in the base image).

-# 115
+## v115

 Revert a pull request.

 - No longer using `sub_env` for `pip install` step.

-# 114
+## v114

 - Bugfixes.

 Blacklisting `PYTHONHOME` and `PYTHONPATH` for older apps. Upgrades to nltk support.

-# 113
+## v113

 Updates to Pipenv support.

-# 112
+## v112

 Bugfix.

 - Fixed grep output bug.

-# 111
+## v111

 Linting, bugfixes.

-# 110
+## v110

 Update default Python to 3.6.2.

-# 109
+## v109

 Update Default Python to 3.6.1, bugfixes.

 - Fixed automatic pip uninstall of dependencies removed from requirements.txt.

-# 108
+## v108

 Fix output for collectstatic step.

-# 107
+## v107

 Bugfix for C dependency installation.

-# 106
+## v106

- Don't install packages that could mess up packaging.
+Don't install packages that could mess up packaging.

 - The Python buildpack will automatically remove `six`, `pyparsing`, `appdirs`,
   `setuptools`, and `distribute` from a `requirements.txt` file now, as these
   packages are provided by the Python buildpack.

- # 105
+## v105

- Improvements to output messaging.
+Improvements to output messaging.

-# 104
+## v104

 General improvements.

@@ -183,52 +350,52 @@ General improvements.

 [395]: https://github.com/heroku/heroku-buildpack-python/pull/395

-## 103
+## v103

 Bug fixes and improvements.

 - Fix for Pipenv.
 - Fix for Heroku CI.
- Improve handling of WEB_CONCURRENCY when using multiple buildpacks.
- Adjust environment variables set during the build to more closely match those in the dyno environment (DYNO is now available, STACK is not).
+- Improve handling of `WEB_CONCURRENCY` when using multiple buildpacks.
+- Adjust environment variables set during the build to more closely match those in the dyno environment (`DYNO` is now available, `STACK` is not).
 - Restore the build cache prior to running bin/pre_compile.

-## 102
+## v102

 Buildpack code cleanup.

 - Improved messaging around NLTK.

-## 101
+## v101

 Updated setuptools installation method.

 - Improved pipenv support.

-## 100
+## v100

 Preliminary pipenv support.

-## 99
+## v99

 Cleanup.

-## 98
+## v98

 Official NLTK support and other improvements.

 - Support for `nltk.txt` file for declaring corpora to be downloaded.
- Leading zeros for auto-set WEB_CONCURRENCY.
+- Leading zeros for auto-set `WEB_CONCURRENCY`.

-## 97
+## v97

 Improved egg-link functionality.

-## 96
+## v96

 Bugfix.

-## 95
+## v95

 Improved output support.

@@ -264,7 +431,7 @@ Fixed bug with editable pip installations.

 Updated default Python 2.7.13.

- Python 2.7.13 uses UCS-4 build, more compatibile with linux wheels.
+- Python 2.7.13 uses UCS-4 build, more compatible with linux wheels.
 - Updated setuptools to v32.1.0.

 ## v86
@@ -290,7 +457,7 @@ Support for Heroku CI.

 ## v82 (2016-08-22)

-Update to library detection mechnisms (pip-pop).
+Update to library detection mechanisms (pip-pop).

 - Updated setuptools to v25.5.0

@@ -364,7 +531,7 @@ Revert to v66.

 ## v68 (2015-10-12)

-Fixed .heroku/venv error with modern apps.
+Fixed `.heroku/venv` error with modern apps.

 ## v67 (2015-10-12)

@@ -389,7 +556,6 @@ Updated Pip and Setuptools.
 - Setuptools updated to v18.3.2
 - Pip updated to v7.1.2

-
 ## v62 (2015-08-07)

 Updated Pip and Setuptools.
@@ -1,13 +0,0 @@
-FROM heroku/heroku:18-build
-
-WORKDIR /app
-ENV WORKSPACE_DIR="/app/builds" \
-    S3_BUCKET="lang-python" \
-    S3_PREFIX="heroku-18/"
-
-RUN apt-get update && apt-get install -y python-pip && rm -rf /var/lib/apt/lists/*
-
-COPY requirements.txt /app/
-RUN pip install --disable-pip-version-check --no-cache-dir -r /app/requirements.txt
-
-COPY . /app
@@ -4,3 +4,5 @@ gem "rspec"
 gem "heroku_hatchet"
 gem "rspec-retry"
 gem "rake"
+gem "parallel_split_test"
+
@@ -1,21 +1,22 @@
 GEM
  remote: https://rubygems.org/
  specs:
-    activesupport (5.2.1)
+    activesupport (6.0.3.1)
      concurrent-ruby (~> 1.0, >= 1.0.2)
      i18n (>= 0.7, < 2)
      minitest (~> 5.1)
      tzinfo (~> 1.1)
-    concurrent-ruby (1.0.5)
+      zeitwerk (~> 2.2, >= 2.2.2)
+    concurrent-ruby (1.1.6)
    diff-lcs (1.3)
    erubis (2.7.0)
-    excon (0.62.0)
-    heroics (0.0.24)
+    excon (0.73.0)
+    heroics (0.0.25)
      erubis (~> 2.0)
      excon
      moneta
      multi_json (>= 1.9.2)
-    heroku_hatchet (4.0.2)
+    heroku_hatchet (5.0.3)
      excon (~> 0)
      minitest-retry (~> 0.1.9)
      platform-api (~> 2)
@@ -23,17 +24,21 @@ GEM
      rrrretry (~> 1)
      thor (~> 0)
      threaded (~> 0)
-    i18n (1.1.0)
+    i18n (1.8.2)
      concurrent-ruby (~> 1.0)
-    minitest (5.11.3)
+    minitest (5.14.1)
    minitest-retry (0.1.9)
      minitest (>= 5.0)
-    moneta (0.8.1)
-    multi_json (1.13.1)
-    platform-api (2.1.0)
-      heroics (~> 0.0.23)
-      moneta (~> 0.8.1)
-    rake (12.3.1)
+    moneta (1.0.0)
+    multi_json (1.14.1)
+    parallel (1.19.1)
+    parallel_split_test (0.7.0)
+      parallel (>= 0.5.13)
+      rspec (>= 3.1.0)
+    platform-api (2.2.0)
+      heroics (~> 0.0.25)
+      moneta (~> 1.0.0)
+    rake (12.3.3)
    repl_runner (0.0.3)
      activesupport
    rrrretry (1.0.0)
@@ -52,20 +57,22 @@ GEM
    rspec-retry (0.6.1)
      rspec-core (> 3.3)
    rspec-support (3.8.0)
-    thor (0.20.0)
+    thor (0.20.3)
    thread_safe (0.3.6)
    threaded (0.0.4)
-    tzinfo (1.2.5)
+    tzinfo (1.2.7)
      thread_safe (~> 0.1)
+    zeitwerk (2.3.0)

 PLATFORMS
  ruby

 DEPENDENCIES
  heroku_hatchet
+  parallel_split_test
  rake
  rspec
  rspec-retry

 BUNDLED WITH
-   1.16.3
+   2.1.4
@@ -1,32 +1,32 @@
 # These targets are not files
-.PHONY: tests
+.PHONY: check test buildenv-heroku-16 buildenv-heroku-18 tools

-test: test-heroku-16
+STACK ?= heroku-18
+TEST_CMD ?= test/run-versions && test/run-features && test/run-deps
+
+ifeq ($(STACK),cedar-14)
+	# Cedar-14 doesn't have a build image varient.
+	IMAGE_TAG := heroku/cedar:14
+else
+	# Converts a stack name of `heroku-NN` to its build Docker image tag of `heroku/heroku:NN-build`.
+	IMAGE_TAG := heroku/$(subst -,:,$(STACK))-build
+endif

 check:
-	@shellcheck -x bin/compile bin/detect bin/release bin/test-compile bin/utils bin/warnings
+	@shellcheck -x bin/compile bin/detect bin/release bin/test-compile bin/utils bin/warnings bin/default_pythons
 	@shellcheck -x bin/steps/collectstatic bin/steps/eggpath-fix  bin/steps/eggpath-fix2 bin/steps/gdal bin/steps/geo-libs bin/steps/mercurial bin/steps/nltk bin/steps/pip-install bin/steps/pip-uninstall bin/steps/pipenv bin/steps/pipenv-python-version bin/steps/pylibmc bin/steps/python
 	@shellcheck -x bin/steps/hooks/*

-test-cedar-14:
-	@echo "Running tests in docker (cedar-14)..."
-	@docker run -v $(shell pwd):/buildpack:ro --rm -it -e "STACK=cedar-14" heroku/cedar:14 bash -c 'cp -r /buildpack /buildpack_test; cd /buildpack_test/; test/run;'
+test:
+	@echo "Running tests using: STACK=$(STACK) TEST_CMD='$(TEST_CMD)'"
 	@echo ""
-
-test-heroku-16:
-	@echo "Running tests in docker (heroku-16)..."
-	@docker run -v $(shell pwd):/buildpack:ro --rm -it -e "STACK=heroku-16" heroku/heroku:16-build bash -c 'cp -r /buildpack /buildpack_test; cd /buildpack_test/; test/run;'
-	@echo ""
-
-test-heroku-18:
-	@echo "Running tests in docker (heroku-18)..."
-	@docker run -v $(shell pwd):/buildpack:ro --rm -it -e "STACK=heroku-18" heroku/heroku:18-build bash -c 'cp -r /buildpack /buildpack_test; cd /buildpack_test/; test/run;'
+	@docker run --rm -it -v $(PWD):/buildpack:ro -e "STACK=$(STACK)" "$(IMAGE_TAG)" bash -c 'cp -r /buildpack /buildpack_test && cd /buildpack_test && $(TEST_CMD)'
 	@echo ""

 buildenv-heroku-16:
 	@echo "Creating build environment (heroku-16)..."
 	@echo
-	@docker build --pull -t python-buildenv-heroku-16 .
+	@docker build --pull -f $(shell pwd)/builds/heroku-16.Dockerfile -t python-buildenv-heroku-16 .
 	@echo
 	@echo "Usage..."
 	@echo
@@ -36,6 +36,19 @@ buildenv-heroku-16:
 	@echo
 	@docker run -it --rm python-buildenv-heroku-16

+buildenv-heroku-18:
+	@echo "Creating build environment (heroku-18)..."
+	@echo
+	@docker build --pull -f $(shell pwd)/builds/heroku-18.Dockerfile -t python-buildenv-heroku-18 .
+	@echo
+	@echo "Usage..."
+	@echo
+	@echo "  $$ export AWS_ACCESS_KEY_ID=foo AWS_SECRET_ACCESS_KEY=bar  # Optional unless deploying"
+	@echo "  $$ bob build runtimes/python-2.7.13"
+	@echo "  $$ bob deploy runtimes/python-2.7.13"
+	@echo
+	@docker run -it --rm python-buildenv-heroku-18
+
 tools:
 	git clone https://github.com/kennethreitz/pip-pop.git
 	mv pip-pop/bin/* vendor/pip-pop/
@@ -86,31 +86,6 @@ Each version is given a distinguishing version number. If the Library as you rec

 If the Library as you received it specifies that a proxy can decide whether future versions of the GNU Lesser General Public License shall apply, that proxy's public statement of acceptance of any version is permanent authorization for you to choose that version for the Library.

-get-pip.py license
------------------
-
-Copyright (c) 2008-2016 The pip developers (see AUTHORS.txt file)
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-
 pip-pop license
 ---------------

@@ -134,4 +109,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
+THE SOFTWARE.
@@ -1,52 +0,0 @@
-{
-    "_meta": {
-        "hash": {
-            "sha256": "36d17c46a8b1b844b3cae475f6f42d6c0a9e59b2a9685cbcdc0985656a7a129f"
-        },
-        "host-environment-markers": {
-            "implementation_name": "cpython",
-            "implementation_version": "3.6.3",
-            "os_name": "posix",
-            "platform_machine": "x86_64",
-            "platform_python_implementation": "CPython",
-            "platform_release": "16.7.0",
-            "platform_system": "Darwin",
-            "platform_version": "Darwin Kernel Version 16.7.0: Thu Jun 15 17:36:27 PDT 2017; root:xnu-3789.70.16~2/RELEASE_X86_64",
-            "python_full_version": "3.6.3",
-            "python_version": "3.6",
-            "sys_platform": "darwin"
-        },
-        "pipfile-spec": 6,
-        "requires": {},
-        "sources": [
-            {
-                "name": "pypi",
-                "url": "https://pypi.python.org/simple",
-                "verify_ssl": true
-            }
-        ]
-    },
-    "default": {
-        "bob-builder": {
-            "hashes": [
-                "sha256:b4de49a8e436fcaf82236ea43f78413b4a4c92100726e382ab57b6bdfb38fe64",
-                "sha256:288e3e765c4890fe9a63ae52ac6b4a963c13fe508482c70ff701a5ae21b9a673"
-            ],
-            "version": "==0.0.13"
-        },
-        "boto": {
-            "hashes": [
-                "sha256:13be844158d1bd80a94c972c806ec8381b9ea72035aa06123c5db6bc6a6f3ead",
-                "sha256:deb8925b734b109679e3de65856018996338758f4b916ff4fe7bb62b6d7000d1"
-            ],
-            "version": "==2.48.0"
-        },
-        "docopt": {
-            "hashes": [
-                "sha256:49b3a825280bd66b3aa83585ef59c4a8c82f2c8a522dbe754a8bc8d08c85c491"
-            ],
-            "version": "==0.6.2"
-        }
-    },
-    "develop": {}
-}
@@ -2,38 +2,57 @@

 # Heroku Buildpack: Python

-[![Build Status](https://travis-ci.org/heroku/heroku-buildpack-python.svg?branch=master)](https://travis-ci.org/heroku/heroku-buildpack-python)
+[![Build Status](https://travis-ci.com/heroku/heroku-buildpack-python.svg?branch=main)](https://travis-ci.com/heroku/heroku-buildpack-python)

-This is the official [Heroku buildpack](https://devcenter.heroku.com/articles/buildpacks) for Python apps, powered by [Pipenv](http://docs.pipenv.org/), [pip](https://pip.pypa.io/) and other excellent software.
+This is the official [Heroku buildpack](https://devcenter.heroku.com/articles/buildpacks) for Python apps.

-Recommended web frameworks include **Django** and **Flask**. The recommended webserver is **Gunicorn**. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to `$PORT`, and only the HTTP protocol is permitted for incoming connections.
+Recommended web frameworks include **Django** and **Flask**, among others. The recommended webserver is **Gunicorn**. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to `$PORT`, and only the HTTP protocol is permitted for incoming connections.

-Python packages with C dependencies that are not [available on the stack image](https://devcenter.heroku.com/articles/stack-packages) are generally not supported, unless `manylinux` wheels are provided by the package maintainers (common). For recommended solutions, check out [this article](https://devcenter.heroku.com/articles/python-c-deps) for more information. 
+Python packages with C dependencies that are not [available on the stack image](https://devcenter.heroku.com/articles/stack-packages) are generally not supported, unless `manylinux` wheels are provided by the package maintainers (common). For recommended solutions, check out [this article](https://devcenter.heroku.com/articles/python-c-deps) for more information.

 See it in Action
 ----------------
+```
+$ ls
+my-application		requirements.txt	runtime.txt

-Deploying a Python application couldn't be easier:
+$ git push heroku main
+Counting objects: 4, done.
+Delta compression using up to 8 threads.
+Compressing objects: 100% (2/2), done.
+Writing objects: 100% (4/4), 276 bytes | 276.00 KiB/s, done.
+Total 4 (delta 0), reused 0 (delta 0)
+remote: Compressing source files... done.
+remote: Building source:
+remote:
+remote: -----> Python app detected
+remote: -----> Installing python-3.7.4
+remote: -----> Installing pip
+remote: -----> Installing SQLite3
+remote: -----> Installing requirements with pip
+remote:        Collecting flask (from -r /tmp/build_c2c067ef79ff14c9bf1aed6796f9ed1f/requirements.txt (line 1))
+remote:          Downloading ...
+remote:        Installing collected packages: Werkzeug, click, MarkupSafe, Jinja2, itsdangerous, flask
+remote:        Successfully installed Jinja2-2.10 MarkupSafe-1.1.0 Werkzeug-0.14.1 click-7.0 flask-1.0.2 itsdangerous-1.1.0
+remote:
+remote: -----> Discovering process types
+remote:        Procfile declares types -> (none)
+remote:
+```

-    $ ls
-    Pipfile		Pipfile.lock	Procfile	web.py
+A `requirements.txt` must be present at the root of your application's repository to deploy.

-    $ heroku create --buildpack heroku/python
+To specify your python version, you also need a `runtime.txt` file - unless you are using the default Python runtime version.

-    $ git push heroku master
-    …
-    -----> Python app detected
-    -----> Installing python-3.6.6
-    -----> Installing pip
-    -----> Installing requirements with Pipenv 2018.5.18…
-           ...
-           Installing dependencies from Pipfile…
-    -----> Discovering process types
-           Procfile declares types -> (none)
+Current default Python Runtime: Python 3.6.9

-A `Pipfile` or `requirements.txt` must be present at the root of your application's repository.
+Alternatively, you can provide a `setup.py` file, or a `Pipfile`.
+Using `pipenv` will generate `runtime.txt` at build time if one of the field `python_version` or `python_full_version` is specified in the `requires` section of your `Pipfile`.

-You can also specify the latest production release of this buildpack for upcoming builds of an existing application:
+Specify a Buildpack Version
+---------------------------
+
+You can specify the latest production release of this buildpack for upcoming builds of an existing application:

    $ heroku buildpacks:set heroku/python

@@ -41,23 +60,36 @@ You can also specify the latest production release of this buildpack for upcomin
 Specify a Python Runtime
 ------------------------

-Specific versions of the Python runtime can be specified in your `Pipfile`:
+Supported runtime options include:

-    [requires]
-    python_version = "2.7"
+- `python-3.8.5`
+- `python-3.7.8`
+- `python-3.6.11`
+- `python-2.7.18`

-Or, more specifically:
+## Tests

-    [requires]
-    python_full_version = "2.7.15"
+The buildpack tests use [Docker](https://www.docker.com/) to simulate
+Heroku's [stack images.](https://devcenter.heroku.com/articles/stack)

-Or, with a `runtime.txt` file:
+To run the test suite against the default stack:

-    $ cat runtime.txt
-    python-2.7.15
+```
+make test
+```

-Runtime options include:
+Or to test against a particular stack:

- `python-3.7.0`
- `python-3.6.6`
- `python-2.7.15`
+```
+make test STACK=heroku-16
+```
+
+To run only a subset of the tests:
+
+```
+make test TEST_CMD=tests/versions
+```
+
+The tests are run via the vendored
+[shunit2](https://github.com/kward/shunit2)
+test framework.
@@ -16,7 +16,9 @@
 set -eo pipefail

 # Boostrap the Buildpack Standard Library.
-export BPLOG_PREFIX="buildpack.python"
+# Disable unused env var warning since shellcheck doesn't know about the stdlib.
+# shellcheck disable=2034
+BPLOG_PREFIX="buildpack.python"
 export BUILDPACK_LOG_FILE=${BUILDPACK_LOG_FILE:-/dev/null}

 [ "$BUILDPACK_XTRACE" ] && set -o xtrace
@@ -42,32 +44,34 @@ export BUILD_DIR CACHE_DIR ENV_DIR
 VENDOR_URL="https://lang-python.s3.amazonaws.com/$STACK"
 if [[ -n ${BUILDPACK_VENDOR_URL:-} ]]; then
    VENDOR_URL="$BUILDPACK_VENDOR_URL"
+elif [[ -n ${USE_STAGING_BINARIES} ]]; then
+    VENDOR_URL="$USE_STAGING_BINARIES/$STACK"
 fi
 export VENDOR_URL

-# Which versions of Python are we using?
-# These variables are used to specify which versions of Python to install by default,
-# as well as prompt the user to upgrade if they are using an un–supported version.
-# Note: When 3.7 lands, I recommend switching to LATEST_36 and LATEST_37.
-DEFAULT_PYTHON_VERSION="python-3.6.6"
-LATEST_36="python-3.6.6"
-LATEST_37="python-3.7.0"
-LATEST_2="python-2.7.15"
+# Default Python Versions
+# shellcheck source=bin/default_pythons
+source "$BIN_DIR/default_pythons"
+
+# Supported Python Branches
+PY38="python-3.8"
+PY37="python-3.7"
+PY36="python-3.6"
+PY35="python-3.5"
+PY34="python-3.4"
+PY27="python-2.7"
+PYPY27="pypy2.7"
+PYPY36="pypy3.6"

 # Which stack is used (for binary downloading), if none is provided (e.g. outside of Heroku)?
 DEFAULT_PYTHON_STACK="cedar-14"
-# If pip doesn't match this version (the version we install), run the installer.
-PIP_UPDATE="9.0.2"
-
-export DEFAULT_PYTHON_VERSION DEFAULT_PYTHON_STACK PIP_UPDATE LATEST_2 LATEST_36 LATEST_37

 # Common Problem Warnings:
 # This section creates a temporary file in which to stick the output of `pip install`.
 # The `warnings` subscript then greps through this for common problems and guides
 # the user towards resolution of known issues.
 WARNINGS_LOG=$(mktemp)
-export WARNINGS_LOG
-export RECOMMENDED_PYTHON_VERSION=$DEFAULT_PYTHON_VERSION
+RECOMMENDED_PYTHON_VERSION=$DEFAULT_PYTHON_VERSION

 # The buildpack ships with a few executable tools (e.g. pip-grep, etc).
 # This installs them into the path, so we can execute them directly.
@@ -133,6 +137,10 @@ export LIBRARY_PATH=/app/.heroku/vendor/lib:/app/.heroku/python/lib:$LIBRARY_PAT
 export LD_LIBRARY_PATH=/app/.heroku/vendor/lib:/app/.heroku/python/lib:$LD_LIBRARY_PATH
 export PKG_CONFIG_PATH=/app/.heroku/vendor/lib/pkg-config:/app/.heroku/python/lib/pkg-config:$PKG_CONFIG_PATH

+# Global pip options (https://pip.pypa.io/en/stable/user_guide/#environment-variables).
+# Disable pip's warnings about EOL Python since we show our own.
+export PIP_NO_PYTHON_VERSION_WARNING=1
+
 # The Application Code
 # --------------------

@@ -149,7 +157,7 @@ cd "$BUILD_DIR"
 # - Once the build is complete, `~/.heroku/{known-paths}` is copied back into the cache.

 # Create the cache directory, if it doesn't exist.
-mkdir -p "$CACHE_DIR"
+mkdir -p "$CACHE_DIR/.heroku"

 # Restore old artifacts from the cache.
 mkdir -p .heroku
@@ -191,8 +199,6 @@ else
  CACHED_PYTHON_STACK=$STACK
 fi

-export CACHED_PYTHON_STACK
-
 # Pipenv Python version support.
 # Detect the version of Python requested from a Pipfile (e.g. python_version or python_full_version).
 # Convert it to a runtime.txt file.
@@ -233,17 +239,8 @@ mtime "python.install.time" "${start}"
 # shellcheck source=bin/steps/pipenv
 source "$BIN_DIR/steps/pipenv"

-# Uninstall removed dependencies with Pip.
-# The buildpack will automatically remove any declared dependencies (in requirements.txt)
-# that were explicitly removed. This machinery is a bit complex, but it is not complicated.
-(( start=$(nowms) ))
-# shellcheck source=bin/steps/pip-uninstall
-source "$BIN_DIR/steps/pip-uninstall"
-mtime "pip.uninstall.time" "${start}"
-
 # If no requirements.txt file given, assume `setup.py develop` is intended.
 # This allows for people to ship a setup.py application to Heroku
-# (which is rare, but I vouch that it should work!)

 if [ ! -f requirements.txt ] && [ ! -f Pipfile ]; then
  echo "-e ." > requirements.txt
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+# Disable unused env var warning, since shellcheck doesn't take into account
+# that this file is sourced. We don't want to use export since it exposes
+# the env vars to subprocesses.
+# shellcheck disable=2034
+
+DEFAULT_PYTHON_VERSION="python-3.6.11"
+LATEST_38="python-3.8.5"
+LATEST_37="python-3.7.8"
+LATEST_36="python-3.6.11"
+LATEST_35="python-3.5.9"
+LATEST_34="python-3.4.10"
+LATEST_27="python-2.7.18"
+PYPY_36="pypy3.6-7.3.1"
+PYPY_27="pypy2.7-7.3.1"
@@ -0,0 +1,21 @@
+# Python Buildpack Install Steps
+
+TODO: Add context on Python install steps, such as why symlinking vs copying
+
+## Installing Python packages using Pip
+
+### Convention: Use `python` process to invoke Pip
+
+We don't use this convention (yet) but this is an upcoming change being considered.
+
+This is a bigger concern on Windows than it is in Linux environments, but an
+emerging convention in the Python community is to invoke pip using:
+
+```
+python3 -m pip [options]
+```
+
+Invoking pip this way ensures correct location - python knows where these
+packages are stored because it put them there (defaults to Python's pathing info).
+
+All normal command line options are available using this method.
@@ -22,13 +22,17 @@ source "$BIN_DIR/utils"
 if (pip-grep -s requirements.txt GDAL gdal pygdal &> /dev/null) then

  if [ ! -f ".heroku/vendor/bin/gdalserver" ]; then
+
+    puts-warn "The vendored GDAL package in the Heroku Python Buildpack now deprecated."
+    puts-warn "To enable GDAL use an alternative buildpack is available here - https://github.com/heroku/heroku-geo-buildpack"
+
    echo "-----> Noticed GDAL. Bootstrapping gdal."
    mkdir -p .heroku/vendor
    # Download and extract cryptography into target vendor directory.
    curl "$VENDORED_GDAL" -s | tar zxv -C .heroku/vendor &> /dev/null
+    mcount "steps.vendor.gdal"
  fi

  GDAL=$(pwd)/vendor
  export GDAL
 fi
-
@@ -22,6 +22,10 @@ source "$BIN_DIR/utils"

 # If GDAL exists within requirements, use vendored gdal.
 if [[ "$BUILD_WITH_GEO_LIBRARIES" ]]; then
+  mcount "buildvar.BUILD_WITH_GEO_LIBRARIES"
+
+  puts-warn "The GDAL, GEOS and PROJ binaries and BUILD_WITH_GEO_LIBRARIES functonality are now deprecated."
+  puts-warn "An alternative buildpack to enable GDAL, GEOS and PROJ use is available here - https://github.com/heroku/heroku-geo-buildpack"

  if [ ! -f ".heroku/vendor/bin/proj" ]; then
    echo "-----> Bootstrapping gdal, geos, proj."
@@ -31,9 +35,11 @@ if [[ "$BUILD_WITH_GEO_LIBRARIES" ]]; then
    curl "$VENDORED_GEOS" -s | tar zxv -C .heroku/vendor &> /dev/null
    curl "$VENDORED_PROJ" -s | tar zxv -C .heroku/vendor &> /dev/null

+    mcount "steps.vendor.geo_libs"
    # Copy libjasper from build image to slug.
    if [[ "$STACK" == "heroku-16" ]]; then
      cp /usr/lib/x86_64-linux-gnu/libjasper.so* ".heroku/vendor/lib/."
+      mcount "steps.vendor.libjasper"
    fi

  fi
@@ -4,6 +4,6 @@
 if [[ -f "requirements.txt" ]]; then
 	if (grep -Fiq "hg+" requirements.txt) then
 		/app/.heroku/python/bin/pip install  mercurial | cleanup | indent
+		mcount "steps.mercurial"
 	fi
 fi
-
@@ -27,6 +27,8 @@ if sp-grep -s nltk; then
        python -m nltk.downloader -d "$BUILD_DIR/.heroku/python/nltk_data" "${nltk_packages[@]}" | indent
        set_env NLTK_DATA "/app/.heroku/python/nltk_data"

+        mcount "buildvar.NLTK_PACKAGES_DEFINITION"
+        mcount "steps.nltk"
    else
        puts-warn "'nltk.txt' not found, not downloading any corpora"
        puts-warn "Learn more: https://devcenter.heroku.com/articles/python-nltk"
@@ -38,6 +38,15 @@ if [ ! "$SKIP_PIP_INSTALL" ]; then
        mcount "failure.none-version"
    fi

+    if grep -qi '^django==1.*' requirements.txt; then
+        puts-warn "Your Django version is nearing the end of its community support."
+        puts-warn "Upgrade to continue to receive security updates and for the best experience with Django."
+        puts-warn "For more information, check out https://www.djangoproject.com/download/#supported-versions"
+    fi
+
+    if [ ! -f "$BUILD_DIR/.heroku/python/bin/pip" ]; then
+        exit 1
+    fi

    /app/.heroku/python/bin/pip install -r "$BUILD_DIR/requirements.txt" --exists-action=w --src=/app/.heroku/src --disable-pip-version-check --no-cache-dir 2>&1 | tee "$WARNINGS_LOG" | cleanup | indent
    PIP_STATUS="${PIPESTATUS[0]}"
@@ -50,12 +59,9 @@ if [ ! "$SKIP_PIP_INSTALL" ]; then
        exit 1
    fi

-    # Smart Requirements handling
    cp requirements.txt .heroku/python/requirements-declared.txt
    /app/.heroku/python/bin/pip freeze --disable-pip-version-check > .heroku/python/requirements-installed.txt

-    echo
-
    # Install test dependencies, for CI.
    if [ "$INSTALL_TEST" ]; then
        if [[ -f "$1/requirements-test.txt" ]]; then
@@ -13,7 +13,7 @@ if [ ! "$SKIP_PIP_INSTALL" ]; then


    if ! pip-diff --stale requirements-declared.txt requirements.txt --exclude setuptools pip wheel > .heroku/python/requirements-stale.txt; then
-      mount "failure.bad-requirements"
+      mcount "failure.bad-requirements"
    fi

    rm -fr requirements-declared.txt
@@ -26,7 +26,7 @@ fi


 if [ ! "$SKIP_PIPENV_INSTALL" ]; then
-    # Pipenv support (Generate requriements.txt with pipenv).
+    # Pipenv support (Generate requirements.txt with pipenv).
    if [[ -f Pipfile ]]; then
        # Measure that we're using Pipenv.
        mcount "tool.pipenv"
@@ -60,10 +60,16 @@ if [ ! "$SKIP_PIPENV_INSTALL" ]; then
        # avoid this eager behavior.
        /app/.heroku/python/bin/pip install pipenv==$PIPENV_VERSION --upgrade --upgrade-strategy only-if-needed &> /dev/null

+        # Install the test dependencies, for CI.
+        if [ "$INSTALL_TEST" ]; then
+            puts-step "Installing test dependencies…"
+            /app/.heroku/python/bin/pipenv install --dev --system --deploy 2>&1 | cleanup | indent
+
        # Install the dependencies.
-        if [[ ! -f Pipfile.lock ]]; then
+        elif [[ ! -f Pipfile.lock ]]; then
            puts-step "Installing dependencies with Pipenv $PIPENV_VERSION…"
            /app/.heroku/python/bin/pipenv install --system --skip-lock 2>&1 | indent
+
        else
            pipenv-to-pip Pipfile.lock > requirements.txt
            "$BIN_DIR/steps/pip-uninstall"
@@ -73,12 +79,6 @@ if [ ! "$SKIP_PIPENV_INSTALL" ]; then
            puts-step "Installing dependencies with Pipenv $PIPENV_VERSION…"
            /app/.heroku/python/bin/pipenv install --system --deploy 2>&1 | indent
        fi
-
-        # Install the test dependencies, for CI.
-        if [ "$INSTALL_TEST" ]; then
-            puts-step "Installing test dependencies…"
-            /app/.heroku/python/bin/pipenv install --dev --system --deploy 2>&1 | cleanup | indent
-        fi
    fi
 else
    export SKIP_PIP_INSTALL=1
@@ -19,7 +19,7 @@ if [[ -f $BUILD_DIR/Pipfile ]]; then
            if [[ "$PYTHON" == "null" ]]; then
                PYTHON=$(jq -r '._meta.requires.python_version' "$BUILD_DIR/Pipfile.lock")
                if [ "$PYTHON" = 2.7 ]; then
-                    echo "$LATEST_2" > "$BUILD_DIR/runtime.txt"
+                    echo "$LATEST_27" > "$BUILD_DIR/runtime.txt"
                fi
                if [ "$PYTHON" = 3.6 ]; then
                    echo "$LATEST_36" > "$BUILD_DIR/runtime.txt"
@@ -27,10 +27,12 @@ if [[ -f $BUILD_DIR/Pipfile ]]; then
                if [ "$PYTHON" = 3.7 ]; then
                    echo "$LATEST_37" > "$BUILD_DIR/runtime.txt"
                fi
+                if [ "$PYTHON" = 3.8 ]; then
+                    echo "$LATEST_38" > "$BUILD_DIR/runtime.txt"
+                fi
            fi


        fi
    fi
 fi
-
@@ -29,6 +29,7 @@ if (pip-grep -s requirements.txt pylibmc &> /dev/null) then
    mkdir -p .heroku/vendor
    # Download and extract libmemcached into target vendor directory.
    curl "$VENDORED_MEMCACHED" -s | tar zxv -C .heroku/vendor &> /dev/null
+    mcount "steps.vendor.pylibmc"
  fi

  LIBMEMCACHED=$(pwd)/vendor
@@ -7,41 +7,78 @@ PYTHON_VERSION=$(cat runtime.txt)
 # The location of the pre-compiled python binary.
 VENDORED_PYTHON="${VENDOR_URL}/runtimes/$PYTHON_VERSION.tar.gz"

-if [[ $PYTHON_VERSION =~ ^python-2 ]]; then
-  if [[ "$PYTHON_VERSION" != "$LATEST_2" ]]; then
-    puts-warn "The latest version of Python 2 is $LATEST_2 (you are using $PYTHON_VERSION, which is unsupported)."
-    puts-warn "We recommend upgrading by specifying the latest version ($LATEST_2)."
-    echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
-  else
-    echo "       Using supported version of Python 2 ($PYTHON_VERSION)"
-  fi
-else
-  if [[ $PYTHON_VERSION =~ ^python-3 ]]; then
-    if [[ $PYTHON_VERSION =~ ^python-3.7 ]]; then
-      if [[ "$PYTHON_VERSION" != "$LATEST_37" ]]; then
-      puts-warn "The latest version of Python 3.7 is $LATEST_37 (you are using $PYTHON_VERSION, which is unsupported)."
-      puts-warn "We recommend upgrading by specifying the latest version ($LATEST_37)."
+SECURITY_UPDATE="Python has released a security update! Please consider upgrading to"
+
+ONLY_SUPPORTED_2_VERSION="Only the latest version of Python 2 is supported on the platform. Please consider upgrading to"
+
+PYTHON_2_EOL_UPDATE="Python 2 has reached it's community EOL. Upgrade your Python runtime to maintain a secure application as soon as possible."
+
+# check if runtime exists
+if curl --output /dev/null --silent --head --fail "$VENDORED_PYTHON"; then
+  if [[ "$PYTHON_VERSION" == $PY38* ]]; then
+    # do things to alert the user of security release available
+    if [ "$PYTHON_VERSION" != "$LATEST_38" ]; then
+      puts-warn "$SECURITY_UPDATE" "$LATEST_38"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
-      else
-        echo "       Using supported version of Python 3.7 ($PYTHON_VERSION)"
-      fi
-    else
-      if [[ $PYTHON_VERSION =~ ^python-3.6 ]]; then
-        if [[ "$PYTHON_VERSION" != "$LATEST_36" ]]; then
-          puts-warn "The latest version of Python 3.6 is $LATEST_36 (you are using $PYTHON_VERSION, which is unsupported)."
-          puts-warn "We recommend upgrading by specifying the latest version ($LATEST_36)."
-          echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
-        else
-          echo "       Using supported version of Python 3.6 ($PYTHON_VERSION)"
-        fi
-      else
-        puts-warn "Heroku supports runtime versions $LATEST_37, $LATEST_36 and $LATEST_2." 
-        puts-warn "You are using $PYTHON_VERSION, which is unsupported."
-        puts-warn "We recommend upgrading by specifying the default supported version ($LATEST_36)."
-        echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
-      fi
    fi
  fi
+  if [[ "$PYTHON_VERSION" == $PY37* ]]; then
+    # do things to alert the user of security release available
+    if [ "$PYTHON_VERSION" != "$LATEST_37" ]; then
+      puts-warn "$SECURITY_UPDATE" "$LATEST_37"
+      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
+    fi
+  fi
+  if [[ "$PYTHON_VERSION" == $PY36* ]]; then
+    # security update note
+    if [ "$PYTHON_VERSION" != "$LATEST_36" ]; then
+      puts-warn "$SECURITY_UPDATE" "$LATEST_36"
+      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
+    fi
+  fi
+  if [[ "$PYTHON_VERSION" == $PY35* ]]; then
+    # security update note
+    if [ "$PYTHON_VERSION" != "$LATEST_35" ]; then
+      puts-warn "$SECURITY_UPDATE" "$LATEST_35"
+      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
+    fi
+  fi
+  if [[ "$PYTHON_VERSION" == $PY34* ]]; then
+    # security update note
+    if [ "$PYTHON_VERSION" != "$LATEST_34" ]; then
+      puts-warn "$SECURITY_UPDATE" "$LATEST_34"
+      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
+    fi
+  fi
+  if [[ "$PYTHON_VERSION" == $PY27* ]]; then
+    # security update note
+    if [[ "$(date "+%Y")" -gt "2019" ]]; then
+      puts-warn "$PYTHON_2_EOL_UPDATE"
+      echo "       Learn More: https://devcenter.heroku.com/articles/python-2-7-eol-faq"
+    fi
+    if [ "$PYTHON_VERSION" != "$LATEST_27" ]; then
+      puts-warn "$ONLY_SUPPORTED_2_VERSION" "$LATEST_27"
+      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
+    fi
+  fi
+  if [[ "$PYTHON_VERSION" == $PYPY27* ]]; then
+    # security update note
+    if [ "$PYTHON_VERSION" != "$PYPY_27" ]; then
+      puts-warn "Could not find that Pypy version. Did you mean" "${PYPY_27}?"
+      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
+    fi
+  fi
+  if [[ "$PYTHON_VERSION" == $PYPY36* ]]; then
+    # security update note
+    if [ "$PYTHON_VERSION" != "$PYPY_36" ]; then
+      puts-warn "Could not find that Pypy version. Did you mean" "${PYPY_36}?"
+      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
+    fi
+  fi
+else
+  puts-warn "Requested runtime ($PYTHON_VERSION) is not available for this stack ($STACK)."
+  puts-warn "Aborting.  More info: https://devcenter.heroku.com/articles/python-support"
+  exit 1
 fi

 if [[ "$STACK" != "$CACHED_PYTHON_STACK" ]]; then
@@ -49,14 +86,6 @@ if [[ "$STACK" != "$CACHED_PYTHON_STACK" ]]; then
    rm -fr .heroku/python-stack .heroku/python-version .heroku/python .heroku/vendor .heroku/python .heroku/python-sqlite3-version
 fi

-# need to clear the cache for first time installing SQLite3,
-# since the version is changing and could lead to runtime errors
-# with compiled extensions.
-if [ -d .heroku/python ] && [ ! -f .heroku/python-sqlite3-version ] && python_sqlite3_check "$PYTHON_VERSION"; then
-  puts-step "Need to update SQLite3, clearing cache"
-  rm -fr .heroku/python-stack .heroku/python-version .heroku/python .heroku/vendor
-fi
-
 if [ -f .heroku/python-version ]; then
  if [ ! "$(cat .heroku/python-version)" = "$PYTHON_VERSION" ]; then
      puts-step "Found $(cat .heroku/python-version), removing"
@@ -66,6 +95,24 @@ if [ -f .heroku/python-version ]; then
  fi
 fi

+# Check if we should reinstall python dependencies
+if [[ ! -f "$CACHE_DIR/.heroku/requirements.txt" ]]; then
+  # IF there's no cached dependencies, update cached version of requirements.txt
+  # This should only run for new apps and first deploys after this update
+  cp -R "$BUILD_DIR/requirements.txt" "$CACHE_DIR/.heroku/requirements.txt"
+else
+  # IF there IS a cached directory, check for differences with the new one
+  if ! diff "$BUILD_DIR/requirements.txt" "$CACHE_DIR/.heroku/requirements.txt" &> /dev/null; then
+    puts-step "Requirements file has been changed, clearing cached dependencies"
+    # if there are any differences, clear the Python cache
+    # Installing Python over again does not take noticably more time
+    cp -R "$BUILD_DIR/requirements.txt" "$CACHE_DIR/.heroku/requirements.txt"
+    rm -rf .heroku/python
+    unset SKIP_INSTALL
+  else
+    puts-step "No change in requirements detected, installing from cache"
+  fi
+fi

 if [ ! "$SKIP_INSTALL" ]; then
    puts-step "Installing $PYTHON_VERSION"
@@ -84,25 +131,58 @@ if [ ! "$SKIP_INSTALL" ]; then
  # Record for future reference.
  echo "$PYTHON_VERSION" > .heroku/python-version
  echo "$STACK" > .heroku/python-stack
-  FRESH_PYTHON=true

  hash -r
 fi

+set -e

-# If Pip isn't up to date:
-if [ "$FRESH_PYTHON" ] || [[ ! $(pip --version) == *$PIP_UPDATE* ]]; then
-
-  puts-step "Installing pip"
-
-  # Remove old installations.
-  rm -fr /app/.heroku/python/lib/python*/site-packages/pip-*
-  rm -fr /app/.heroku/python/lib/python*/site-packages/setuptools-*
-
-  /app/.heroku/python/bin/python "$ROOT_DIR/vendor/get-pip.py" pip=="$PIP_UPDATE" &> /dev/null
-  /app/.heroku/python/bin/pip install "$ROOT_DIR/vendor/setuptools-39.0.1-py2.py3-none-any.whl" &> /dev/null
+PIP_VERSION='20.1.1'
+# Must use setuptools <47.2.0 until we fix:
+# https://github.com/heroku/heroku-buildpack-python/issues/1006
+SETUPTOOLS_VERSION='47.1.1'
+WHEEL_VERSION='0.34.2'

+if [[ "${PYTHON_VERSION}" == ${PY34}* ]]; then
+  # Python 3.4 support was dropped in pip 19.2+, setuptools 44+ and wheel 0.34+.
+  PIP_VERSION='19.1.1'
+  SETUPTOOLS_VERSION='43.0.0'
+  WHEEL_VERSION='0.33.6'
+elif [[ "${PYTHON_VERSION}" == ${PY27}* || "${PYTHON_VERSION}" == ${PYPY27}* ]]; then
+  # Python 2.7 support was dropped in setuptools 45+.
+  SETUPTOOLS_VERSION='44.1.1'
 fi

-set -e
+# We don't use get-pip.py, since:
+#  - it uses `--force-reinstall`, which is unnecessary here and slows down repeat builds
+#  - it means downloading pip twice (once embedded in get-pip.py, and again during
+#    the install, since get-pip.py can't install the embedded version directly)
+#  - we would still have to manage several versions of get-pip.py, to support older Pythons.
+# Instead, we use the pip wheel to install itself, using the method described here:
+# https://github.com/pypa/pip/issues/2351#issuecomment-69994524
+PIP_WHEEL_FILENAME="pip-${PIP_VERSION}-py2.py3-none-any.whl"
+PIP_WHEEL_URL="https://lang-python.s3.amazonaws.com/common/${PIP_WHEEL_FILENAME}"
+PIP_WHEEL="${TMPDIR:-/tmp}/${PIP_WHEEL_FILENAME}"
+
+if ! curl -sSf "${PIP_WHEEL_URL}" -o "$PIP_WHEEL"; then
+  mcount "failure.python.download-pip"
+  puts-warn "Failed to download pip"
+  exit 1
+fi
+
+if [[ -f "$BUILD_DIR/Pipfile" ]]; then
+  # The buildpack is pinned to old pipenv, which requires older pip.
+  # Pip 9.0.2 doesn't support installing itself from a wheel, so we have to use split
+  # versions here (ie: installer pip version different from target pip version).
+  PIP_VERSION='9.0.2'
+  PIP_TO_INSTALL="pip==${PIP_VERSION}"
+else
+  PIP_TO_INSTALL="${PIP_WHEEL}"
+fi
+
+puts-step "Installing pip ${PIP_VERSION}, setuptools ${SETUPTOOLS_VERSION} and wheel ${WHEEL_VERSION}"
+
+/app/.heroku/python/bin/python "${PIP_WHEEL}/pip" install --quiet --disable-pip-version-check --no-cache \
+  "${PIP_TO_INSTALL}" "setuptools==${SETUPTOOLS_VERSION}" "wheel==${WHEEL_VERSION}"
+
 hash -r
@@ -3,15 +3,8 @@
 # shellcheck source=bin/utils
 source "$BIN_DIR/utils"

-sqlite3_version() {
-  SQLITE3_VERSION=${SQLITE3_VERSION:-$(dpkg -s libsqlite3-0 | grep Version | sed 's/Version: //')}
-
-  export SQLITE3_VERSION
-}
-
 sqlite3_install() {
  HEROKU_PYTHON_DIR="$1"
-  SQLITE3_VERSION="$2"
  HEADERS_ONLY="$3"

  mkdir -p "$HEROKU_PYTHON_DIR"
@@ -29,9 +22,9 @@ sqlite3_install() {

  apt-get $APT_OPTIONS update > /dev/null 2>&1
  if [ -z "$HEADERS_ONLY" ]; then
-    apt-get $APT_OPTIONS -y -d --reinstall install libsqlite3-dev="$SQLITE3_VERSION" sqlite3="$SQLITE3_VERSION" > /dev/null 2>&1
+    apt-get $APT_OPTIONS -y -d --reinstall install libsqlite3-dev sqlite3 > /dev/null 2>&1
  else
-    apt-get $APT_OPTIONS -y -d --reinstall install libsqlite3-dev="$SQLITE3_VERSION"
+    apt-get $APT_OPTIONS -y -d --reinstall install libsqlite3-dev
  fi

  find "$APT_CACHE_DIR/archives/" -name "*.deb" -exec dpkg -x {} "$HEROKU_PYTHON_DIR/sqlite3/" \;
@@ -64,7 +57,6 @@ sqlite3_install() {
 }

 buildpack_sqlite3_install() {
-  sqlite3_version
  HEROKU_PYTHON_DIR="$BUILD_DIR/.heroku/python"

  SQLITE3_VERSION_FILE="$BUILD_DIR/.heroku/python-sqlite3-version"
@@ -72,16 +64,14 @@ buildpack_sqlite3_install() {
    INSTALLED_SQLITE3_VERSION=$(cat "$SQLITE3_VERSION_FILE")
  fi

-  # python version check
-  if python_sqlite3_check "$PYTHON_VERSION"; then
-    # only install if the sqlite3 version has changed
-    if [ "$INSTALLED_SQLITE3_VERSION" != "$SQLITE3_VERSION" ]; then
-      puts-step "Installing SQLite3"
-      sqlite3_install "$BUILD_DIR/.heroku/python" "$SQLITE3_VERSION"
+  puts-step "Installing SQLite3"

-      # save version installed
-      mkdir -p "$CACHE_DIR/.heroku/"
-      echo "$SQLITE3_VERSION" > "$CACHE_DIR/.heroku/python-sqlite3-version"
-    fi
+  if sqlite3_install "$BUILD_DIR/.heroku/python" ; then
+    mcount "success.python.sqlite3"
+  else
+    echo "Sqlite3 failed to install."
+    mcount "failure.python.sqlite3"
  fi
+
+  mkdir -p "$CACHE_DIR/.heroku/"
 }
@@ -89,10 +89,9 @@ python3_check() {
 # Check if Python version needs to install SQLite3
 python_sqlite3_check() {
  VERSION="$1"
-  MIN_PYTHON_3="python-3.6.6"
+  MIN_PYTHON_3="python-3.5.6"
  MIN_PYTHON_2="python-2.7.15"

  ( python2_check "$VERSION" && version_gte "$VERSION" "$MIN_PYTHON_2" ) \
-    || ( python3_check "$VERSION" && version_gte "$VERSION" "$MIN_PYTHON_3" ) \
-    || ( version_gte "$VERSION" "3.7.0" )
+    || ( python3_check "$VERSION" && version_gte "$VERSION" "$MIN_PYTHON_3" )
 }
@@ -1,41 +1,57 @@
 # Python Buildpack Binaries

-For Cedar-14 stack
------------------
+## Building the Docker Images

-To get started with it, create an app on Heroku inside a clone of this repository, and set your S3 config vars:
+**After every change to your formulae, perform the following** from the root of the Git repository (not from `builds/`) to rebuild the images for each stack:

-    $ heroku create --buildpack https://github.com/heroku/heroku-buildpack-python#not-heroku
-    $ heroku config:set WORKSPACE_DIR=builds
-    $ heroku config:set AWS_ACCESS_KEY_ID=<your_aws_key>
-    $ heroku config:set AWS_SECRET_ACCESS_KEY=<your_aws_secret>
-    $ heroku config:set S3_BUCKET=<your_s3_bucket_name>
+    $ docker build --pull --tag heroku-python-build-cedar-14 --file $(pwd)/builds/cedar-14.Dockerfile .
+    $ docker build --pull --tag heroku-python-build-heroku-16 --file $(pwd)/builds/heroku-16.Dockerfile .
+    $ docker build --pull --tag heroku-python-build-heroku-18 --file $(pwd)/builds/heroku-18.Dockerfile .

+## Using the Image

-Then, shell into an instance and run a build by giving the name of the formula inside `builds`:
+You can e.g. `bash` into each of the images you built using their tag:

-    $ heroku run bash
-    Running `bash` attached to terminal... up, run.6880
-    ~ $ bob build runtimes/python-2.7.6
+    docker run --rm -ti heroku-python-build-cedar-14 bash
+    docker run --rm -ti heroku-python-build-heroku-16 bash
+    docker run --rm -ti heroku-python-build-heroku-18 bash

-    Fetching dependencies... found 2:
-      - libraries/sqlite
+You then have a shell where you can run `bob build`, `bob deploy`, and so forth. You can of course also invoke these programs directly with `docker run`:

-    Building formula runtimes/python-2.7.6:
-        === Building Python 2.7.6
-        Fetching Python v2.7.6 source...
-        Compiling...
+    docker run --rm -ti heroku-python-build-heroku-18 bob build runtimes/python-2.7.15

-If this works, run `bob deploy` instead of `bob build` to have the result uploaded to S3 for you.
+In order to `bob deploy`, AWS credentials must be set up, as well as name and prefix of your custom S3 bucket (unless you're deploying to the Heroku production buckets that are pre-defined in each `Dockerfile`); see next section for details.

-To speed things up drastically, it'll usually be a good idea to `heroku run bash --size PX` instead.
+## Configuration

-For Heroku-16 stack
-------------------
+File `dockerenv.default` contains a list of required env vars; most of these have default values defined in `Dockerfile`. You can copy this file to a location outside the buildpack and modify it with the values you desire and pass its location with `--env-file`, or pass the env vars to `docker run` using `--env`.

-1. Ensure GNU Make and Docker are installed.
-2. From the root of the buildpack repository, run: `make buildenv-heroku-16`
-3. Follow the instructions displayed!
+Out of the box, each `Dockerfile` has the correct values predefined for `S3_BUCKET`, `S3_PREFIX`, and `S3_REGION`. If you're building your own packages, you'll likely want to change `S3_BUCKET` and `S3_PREFIX` to match your info. Instead of setting `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` into that file, you may also pass them to `docker run` through the environment, or explicitly using `--env`, in order to prevent accidental commits of credentials.

+### Passing AWS credentials to the container

-Enjoy :)
+If you want to deploy packages and thus need to pass `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY`, you can either pass them explicitly, through your environment, or through an env file.
+
+#### Passing credentials explicitly
+
+    docker run --rm -ti -e AWS_ACCESS_KEY_ID=... -e AWS_SECRET_ACCESS_KEY=... heroku-python-build-heroku-18 bash
+
+#### Passing credentials through  the environment
+
+The two environment variables `AWS_ACCESS_KEY_ID`and `AWS_SECRET_ACCESS_KEY` are defined in `builds/dockerenv.default`, without values. This will cause Docker to "forward" values for these variables from the current environment, so you can pass them in:
+
+    AWS_ACCESS_KEY_ID=... AWS_SECRET_ACCESS_KEY=... docker run --rm -ti --env-file=builds/dockerenv.default heroku-python-build-heroku-18 bash
+
+or
+
+    export AWS_ACCESS_KEY_ID=...
+    export AWS_SECRET_ACCESS_KEY=...
+    docker run --rm -ti --env-file=builds/dockerenv.default heroku-python-build-heroku-18 bash
+
+#### Passing credentials through a separate env file
+
+This method is the easiest for users who want to build packages in their own S3 bucket, as they will have to adjust the `S3_BUCKET` and `S3_PREFIX` environment variable values anyway from their default values.
+
+For this method, it is important to keep the credentials file in a location outside the buildpack, so that your credentials aren't accidentally committed. Copy `builds/dockerenv.default` **to a safe location outside the buildpack directory**, and insert your values for `AWS_ACCESS_KEY_ID`and `AWS_SECRET_ACCESS_KEY`.
+
+    docker run --rm -ti --env-file=../SOMEPATHOUTSIDE/s3.env heroku-python-build-heroku-18 bash
@@ -0,0 +1,15 @@
+FROM heroku/cedar:14
+
+WORKDIR /app
+ENV WORKSPACE_DIR="/app/builds" \
+    S3_BUCKET="lang-python" \
+    S3_PREFIX="cedar-14/" \
+    DEBIAN_FRONTEND=noninteractive \
+    STACK="cedar-14"
+
+RUN apt-get update && apt-get install -y python-pip libsqlite3-dev realpath && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt /app/
+RUN pip install -r /app/requirements.txt
+
+COPY . /app
@@ -0,0 +1,5 @@
+AWS_ACCESS_KEY_ID
+AWS_SECRET_ACCESS_KEY
+S3_BUCKET
+S3_PREFIX
+S3_REGION
@@ -3,9 +3,11 @@ FROM heroku/heroku:16-build
 WORKDIR /app
 ENV WORKSPACE_DIR="/app/builds" \
    S3_BUCKET="lang-python" \
-    S3_PREFIX="heroku-16/"
+    S3_PREFIX="heroku-16/" \
+    DEBIAN_FRONTEND=noninteractive \
+    STACK="heroku-16"

-RUN apt-get update && apt-get install -y python-pip && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y python-pip libsqlite3-dev && rm -rf /var/lib/apt/lists/*

 COPY requirements.txt /app/
 RUN pip install --disable-pip-version-check --no-cache-dir -r /app/requirements.txt
@@ -0,0 +1,15 @@
+FROM heroku/heroku:18-build
+
+WORKDIR /app
+ENV WORKSPACE_DIR="/app/builds" \
+    S3_BUCKET="lang-python" \
+    S3_PREFIX="heroku-18/" \
+    DEBIAN_FRONTEND=noninteractive \
+    STACK="heroku-18"
+
+RUN apt-get update && apt-get install --no-install-recommends -y python-pip-whl=9.0.1-2 python-pip=9.0.1-2 python-setuptools python-wheel libsqlite3-dev && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt /app/
+RUN pip install --disable-pip-version-check --no-cache-dir -r /app/requirements.txt
+
+COPY . /app
@@ -1,28 +0,0 @@
-#!/usr/bin/env bash
-# Build Path: /app/.heroku/vendor/
-
-OUT_PREFIX=$1
-
-# Skip the build for heroku-16.
-if [[ $S3_PREFIX == "heroku-16" ]]; then
-    exit 0
-fi
-
-# Use new path, containing autoconf.
-export PATH="/app/.heroku/python/bin/:$PATH"
-hash -r
-
-
-echo "Building libffi…"
-
-SOURCE_TARBALL='ftp://sourceware.org/pub/libffi/libffi-3.1.tar.gz'
-
-curl -L $SOURCE_TARBALL | tar x
-
-cd libffi-3.1
-./configure --prefix=$OUT_PREFIX --disable-static &&
-make
-make install
-
-# Cleanup
-cd ..
@@ -3,9 +3,9 @@

 OUT_PREFIX=$1

-# Skip the build for heroku-16.
-if [[ $S3_PREFIX == "heroku-16" ]]; then
-    exit 0
+if [[ $S3_PREFIX != "cedar-14" ]]; then
+    echo "libmemcached only needs to be built for cedar-14, since newer stacks include it in the base image"
+    exit 1
 fi

 # fail hard
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+# fail hard
+set -o pipefail
+# fail harder
+set -eu
+
+OUT_PREFIX=$1
+
+dep_formula=${0#$WORKSPACE_DIR/} # this is the original script, e.g. pypy-5.3.1
+dep_name=$(basename $BASH_SOURCE) # this is us
+dep_version=${dep_formula##*"/${dep_name}-"} # "subtract" our name from full version name
+dep_package=${dep_name}2-v${dep_version} # it's always "pypy2-…"
+dep_dirname=${dep_package}-linux64
+dep_archive_name=${dep_dirname}.tar.bz2
+dep_url=https://bitbucket.org/pypy/pypy/downloads/${dep_archive_name}
+
+echo "Building PyPy…"
+
+curl -L "${dep_url}" | tar jx -C "${OUT_PREFIX}" --strip-components 1 # extract to $OUT_PREFIX, drop the first directory level, which is the archive name
+
+ln "$OUT_PREFIX/bin/pypy" "$OUT_PREFIX/bin/python"
@@ -2,13 +2,4 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite

-# NOTICE: This formula only works for the cedar-14 stack, not cedar.
-
-OUT_PREFIX=$1
-
-echo "Building PyPy…"
-SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.3.1-linux64.tar.bz2'
-curl -L $SOURCE_TARBALL | tar jx
-cp -R pypy2-v5.3.1-linux64/* $OUT_PREFIX
-
-ln $OUT_PREFIX/bin/pypy $OUT_PREFIX/bin/python
+source $(dirname $0)/pypy
@@ -2,13 +2,4 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite

-# NOTICE: This formula only works for the cedar-14 stack, not cedar.
-
-OUT_PREFIX=$1
-
-echo "Building PyPy…"
-SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.6.0-linux64.tar.bz2'
-curl -L $SOURCE_TARBALL | tar jx
-cp -R pypy2-v5.6.0-linux64/* $OUT_PREFIX
-
-ln $OUT_PREFIX/bin/pypy $OUT_PREFIX/bin/python
+source $(dirname $0)/pypy
@@ -2,13 +2,4 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite

-# NOTICE: This formula only works for the cedar-14 and heroku-16 stacks, not cedar.
-
-OUT_PREFIX=$1
-
-echo "Building PyPy…"
-SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.7.0-linux64.tar.bz2'
-curl -L $SOURCE_TARBALL | tar jx
-cp -R pypy2-v5.7.0-linux64/* $OUT_PREFIX
-
-ln $OUT_PREFIX/bin/pypy $OUT_PREFIX/bin/python
+source $(dirname $0)/pypy
@@ -2,13 +2,4 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite

-# NOTICE: This formula only works for the cedar-14 stack, not cedar.
-
-OUT_PREFIX=$1
-
-echo "Building PyPy…"
-SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.7.1-linux64.tar.bz2'
-curl -L $SOURCE_TARBALL | tar jx
-cp -R pypy2-v5.7.1-linux64/* $OUT_PREFIX
-
-ln $OUT_PREFIX/bin/pypy $OUT_PREFIX/bin/python
+source $(dirname $0)/pypy
@@ -2,11 +2,4 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building PyPy…"
-SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.8.0-linux64.tar.bz2'
-curl -L $SOURCE_TARBALL | tar jx
-cp -R pypy2-v5.8.0-linux64/* $OUT_PREFIX
-
-ln $OUT_PREFIX/bin/pypy $OUT_PREFIX/bin/python
+source $(dirname $0)/pypy
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+# fail hard
+set -o pipefail
+# fail harder
+set -eu
+
+OUT_PREFIX=$1
+
+dep_formula=${0#$WORKSPACE_DIR/} # this is the original script, e.g. pypy-5.3.1
+dep_name=$(basename $BASH_SOURCE) # this is us
+dep_version=${dep_formula##*"/${dep_name}-"} # "subtract" our name from full version name
+dep_package=${dep_name}-v${dep_version} # it's always "pypy2-…"
+dep_dirname=${dep_package}-linux64
+dep_archive_name=${dep_dirname}.tar.bz2
+dep_url=https://bitbucket.org/pypy/pypy/downloads/${dep_archive_name}
+
+echo "Building PyPy…"
+echo "${dep_url}"
+
+curl -L "${dep_url}" | tar jx -C "${OUT_PREFIX}" --strip-components 1 # extract to $OUT_PREFIX, drop the first directory level, which is the archive name
+
+ln "$OUT_PREFIX/bin/pypy" "$OUT_PREFIX/bin/python"
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/pypy2.7
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/pypy2.7
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+# fail hard
+set -o pipefail
+# fail harder
+set -eu
+
+OUT_PREFIX=$1
+
+dep_formula=${0#$WORKSPACE_DIR/} # this is the original script, e.g. pypy-5.3.1
+dep_name=$(basename $BASH_SOURCE) # this is us
+dep_version=${dep_formula##*"/${dep_name}-"} # "subtract" our name from full version name
+dep_package=${dep_name}${dep_version_prefix:-}-v${dep_version}${dep_version_suffix:-}
+dep_dirname=${dep_package}-linux64
+dep_archive_name=${dep_dirname}.tar.bz2
+dep_url=https://bitbucket.org/pypy/pypy/downloads/${dep_archive_name}
+
+echo "Building PyPy3…"
+
+curl -L "${dep_url}" | tar jx -C "${OUT_PREFIX}" --strip-components 1 # extract to $OUT_PREFIX, drop the first directory level, which is the archive name
+
+ln "$OUT_PREFIX/bin/pypy3" "$OUT_PREFIX/bin/python"
@@ -2,13 +2,4 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite

-# NOTICE: This formula only works for the cedar-14 stack, not cedar.
-
-OUT_PREFIX=$1
-
-echo "Building PyPy…"
-SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy3-2.4.0-linux64.tar.bz2'
-curl -L $SOURCE_TARBALL | tar jx
-cp -R pypy3-2.4.0-linux64/* $OUT_PREFIX
-
-ln $OUT_PREFIX/bin/pypy3 $OUT_PREFIX/bin/python
+source $(dirname $0)/pypy3
@@ -2,13 +2,7 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite

-# NOTICE: This formula only works for the cedar-14 stack, not cedar.
-
-OUT_PREFIX=$1
-
-echo "Building PyPy…"
-SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy3.3-v5.5.0-alpha-linux64.tar.bz2'
-curl -L $SOURCE_TARBALL | tar jx
-cp -R pypy3-v5.5.0-linux64/* $OUT_PREFIX
-
-ln $OUT_PREFIX/bin/pypy3 $OUT_PREFIX/bin/python
+# version pypy3-5.5.0 is really called pypy3.3-v5.5.0-alpha
+dep_version_prefix=".3"
+dep_version_suffix="-alpha"
+source $(dirname $0)/pypy3
@@ -2,11 +2,4 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building PyPy…"
-SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy3-v5.7.1-linux64.tar.bz2'
-curl -L $SOURCE_TARBALL | tar jx
-cp -R pypy3-v5.7.1-linux64/* $OUT_PREFIX
-
-ln $OUT_PREFIX/bin/pypy3 $OUT_PREFIX/bin/python
+source $(dirname $0)/pypy3
@@ -2,11 +2,4 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building PyPy…"
-SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy3-v5.8.0-linux64.tar.bz2'
-curl -L $SOURCE_TARBALL | tar jx
-cp -R pypy3-v5.8.0-linux64/* $OUT_PREFIX
-
-ln $OUT_PREFIX/bin/pypy3 $OUT_PREFIX/bin/python
+source $(dirname $0)/pypy3
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+# fail hard
+set -o pipefail
+# fail harder
+set -eu
+
+OUT_PREFIX=$1
+
+dep_formula=${0#$WORKSPACE_DIR/} # this is the original script, e.g. pypy-5.3.1
+dep_name=$(basename $BASH_SOURCE) # this is us
+dep_version=${dep_formula##*"/${dep_name}-"} # "subtract" our name from full version name
+dep_package=${dep_name}${dep_version_prefix:-}-v${dep_version}${dep_version_suffix:-}
+dep_dirname=${dep_package}-linux64
+dep_archive_name=${dep_dirname}.tar.bz2
+dep_url=https://bitbucket.org/pypy/pypy/downloads/${dep_archive_name}
+
+echo "Building PyPy3…"
+echo "${dep_url}"
+
+curl -L "${dep_url}" | tar jx -C "${OUT_PREFIX}" --strip-components 1 # extract to $OUT_PREFIX, drop the first directory level, which is the archive name
+
+ln "$OUT_PREFIX/bin/pypy3" "$OUT_PREFIX/bin/python"
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/pypy3.6
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/pypy3.6
@@ -1,15 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/2.7.10/Python-2.7.10.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-2.7.10 src
-cd src
-
-./configure --prefix=$OUT_PREFIX  --with-ensurepip=no
-make
-make install
+source $(dirname $0)/python2
@@ -1,15 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/2.7.11/Python-2.7.11.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-2.7.11 src
-cd src
-
-./configure --prefix=$OUT_PREFIX  --with-ensurepip=no
-make
-make install
+source $(dirname $0)/python2
@@ -1,15 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/2.7.12/Python-2.7.12.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-2.7.12 src
-cd src
-
-./configure --prefix=$OUT_PREFIX  --with-ensurepip=no
-make
-make install
+source $(dirname $0)/python2
@@ -1,19 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/2.7.13/Python-2.7.13.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-2.7.13 src
-cd src
-
-./configure --prefix=$OUT_PREFIX  --enable-unicode=ucs4 --with-ensurepip=no
-make
-make install
-
-# Remove unneeded test directories, similar to the official Docker Python images:
-# https://github.com/docker-library/python
-find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
+source $(dirname $0)/python2
@@ -1,19 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/2.7.14/Python-2.7.14.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-2.7.14 src
-cd src
-
-./configure --prefix=$OUT_PREFIX  --enable-unicode=ucs4 --with-ensurepip=no
-make
-make install
-
-# Remove unneeded test directories, similar to the official Docker Python images:
-# https://github.com/docker-library/python
-find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
+source $(dirname $0)/python2
@@ -1,27 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/

-OUT_PREFIX=$1
-BIN_DIR="$(cd "$(dirname "$0")"/../.. || exit; pwd)/bin"
-export BIN_DIR
-
-# shellcheck source=bin/utils
-source "$BIN_DIR/steps/sqlite3"
-
-sqlite3_version
-echo "Setting up SQLite3 Headers for $SQLITE3_VERSION"
-sqlite3_install "$OUT_PREFIX" "$SQLITE3_VERSION" 1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/2.7.15/Python-2.7.15.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-2.7.15 src
-cd src
-
-./configure --prefix=$OUT_PREFIX  --enable-unicode=ucs4 --with-ensurepip=no
-make
-make install
-
-# Remove unneeded test directories, similar to the official Docker Python images:
-# https://github.com/docker-library/python
-find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
+source $(dirname $0)/python2
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python2
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+OUT_PREFIX=$1
+BIN_DIR="$(cd "$(dirname "$0")"/../.. || exit; pwd)/bin"
+export BIN_DIR
+
+# shellcheck source=bin/utils
+source "$BIN_DIR/steps/sqlite3"
+
+sqlite3_version
+echo "Setting up SQLite3 Headers for $SQLITE3_VERSION"
+sqlite3_install "$OUT_PREFIX" "$SQLITE3_VERSION" 1
+
+echo "Building Python…"
+SOURCE_TARBALL='https://python.org/ftp/python/2.7.17/Python-2.7.17.tgz'
+curl -L $SOURCE_TARBALL | tar xz
+mv Python-2.7.17 src
+cd src
+
+./configure --prefix=$OUT_PREFIX  --enable-unicode=ucs4 --with-ensurepip=no
+make
+make install
+
+# Remove unneeded test directories, similar to the official Docker Python images:
+# https://github.com/docker-library/python
+find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+OUT_PREFIX=$1
+BIN_DIR="$(cd "$(dirname "$0")"/../.. || exit; pwd)/bin"
+export BIN_DIR
+
+# shellcheck source=bin/utils
+source "$BIN_DIR/steps/sqlite3"
+
+sqlite3_version
+echo "Setting up SQLite3 Headers for $SQLITE3_VERSION"
+sqlite3_install "$OUT_PREFIX" "$SQLITE3_VERSION" 1
+
+echo "Building Python…"
+SOURCE_TARBALL='https://python.org/ftp/python/2.7.18/Python-2.7.18.tgz'
+curl -L $SOURCE_TARBALL | tar xz
+mv Python-2.7.18 src
+cd src
+
+./configure --prefix=$OUT_PREFIX  --enable-unicode=ucs4 --with-ensurepip=no
+make
+make install
+
+# Remove unneeded test directories, similar to the official Docker Python images:
+# https://github.com/docker-library/python
+find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
@@ -1,15 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/2.7.9/Python-2.7.9.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-2.7.9 src
-cd src
-
-./configure --prefix=$OUT_PREFIX  --with-ensurepip=no
-make
-make install
+source $(dirname $0)/python2
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+OUT_PREFIX=$1
+BIN_DIR="$(cd "$(dirname "$0")"/../.. || exit; pwd)/bin"
+export BIN_DIR
+
+# shellcheck source=bin/utils
+source "$BIN_DIR/steps/sqlite3"
+
+sqlite3_version
+echo "Setting up SQLite3 Headers for $SQLITE3_VERSION"
+sqlite3_install "$OUT_PREFIX" "$SQLITE3_VERSION" 1
+
+echo "Building Python…"
+SOURCE_TARBALL='https://python.org/ftp/python/3.7.2/Python-3.7.2.tgz'
+curl -L $SOURCE_TARBALL | tar xz
+mv Python-3.7.2 src
+cd src
+
+./configure --prefix=$OUT_PREFIX --with-ensurepip=no
+make
+make install
+
+# Remove unneeded test directories, similar to the official Docker Python images:
+# https://github.com/docker-library/python
+find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
+
+# Remove spare /
+LOCATION=${OUT_PREFIX%?}
+
+ln $LOCATION/bin/python3 $LOCATION/bin/python
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+OUT_PREFIX=$1
+BIN_DIR="$(cd "$(dirname "$0")"/../.. || exit; pwd)/bin"
+export BIN_DIR
+
+# shellcheck source=bin/utils
+source "$BIN_DIR/steps/sqlite3"
+
+sqlite3_version
+echo "Setting up SQLite3 Headers for $SQLITE3_VERSION"
+sqlite3_install "$OUT_PREFIX" "$SQLITE3_VERSION" 1
+
+echo "Building Python…"
+SOURCE_TARBALL='https://python.org/ftp/python/3.4.9/Python-3.4.9.tgz'
+curl -L $SOURCE_TARBALL | tar xz
+mv Python-3.4.9 src
+cd src
+
+./configure --prefix=$OUT_PREFIX --with-ensurepip=no
+make
+make install
+
+# Remove unneeded test directories, similar to the official Docker Python images:
+# https://github.com/docker-library/python
+find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
+
+# Remove spare /
+LOCATION=${OUT_PREFIX%?}
+
+ln $LOCATION/bin/python3 $LOCATION/bin/python
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -1,18 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite
-
-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.5.2/Python-3.5.2.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.5.2 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-# ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python

+source $(dirname $0)/python3
@@ -1,18 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite
-
-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.5.3/Python-3.5.3.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.5.3 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-# ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python

+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -1,18 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite
-
-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.6.0/Python-3.6.0.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.6.0 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python

+source $(dirname $0)/python3
@@ -1,18 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite
-
-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.6.1/Python-3.6.1.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.6.1 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python

+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -1,21 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.6.2/Python-3.6.2.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.6.2 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-# Remove unneeded test directories, similar to the official Docker Python images:
-# https://github.com/docker-library/python
-find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
-
-ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python
+source $(dirname $0)/python3
@@ -1,21 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.6.3/Python-3.6.3.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.6.3 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-# Remove unneeded test directories, similar to the official Docker Python images:
-# https://github.com/docker-library/python
-find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
-
-ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python
+source $(dirname $0)/python3
@@ -1,21 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.6.4/Python-3.6.4.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.6.4 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-# Remove unneeded test directories, similar to the official Docker Python images:
-# https://github.com/docker-library/python
-find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
-
-ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python
+source $(dirname $0)/python3
@@ -1,21 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
-# Build Deps: libraries/sqlite

-OUT_PREFIX=$1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.6.5/Python-3.6.5.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.6.5 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-# Remove unneeded test directories, similar to the official Docker Python images:
-# https://github.com/docker-library/python
-find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
-
-ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python
+source $(dirname $0)/python3
@@ -1,29 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/

-OUT_PREFIX=$1
-BIN_DIR="$(cd "$(dirname "$0")"/../.. || exit; pwd)/bin"
-export BIN_DIR
-
-# shellcheck source=bin/utils
-source "$BIN_DIR/steps/sqlite3"
-
-sqlite3_version
-echo "Setting up SQLite3 Headers for $SQLITE3_VERSION"
-sqlite3_install "$OUT_PREFIX" "$SQLITE3_VERSION" 1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.6.6/Python-3.6.6.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.6.6 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-# Remove unneeded test directories, similar to the official Docker Python images:
-# https://github.com/docker-library/python
-find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
-
-ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -1,29 +1,4 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/

-OUT_PREFIX=$1
-BIN_DIR="$(cd "$(dirname "$0")"/../.. || exit; pwd)/bin"
-export BIN_DIR
-
-# shellcheck source=bin/utils
-source "$BIN_DIR/steps/sqlite3"
-
-sqlite3_version
-echo "Setting up SQLite3 Headers for $SQLITE3_VERSION"
-sqlite3_install "$OUT_PREFIX" "$SQLITE3_VERSION" 1
-
-echo "Building Python…"
-SOURCE_TARBALL='https://python.org/ftp/python/3.7.0/Python-3.7.0.tgz'
-curl -L $SOURCE_TARBALL | tar xz
-mv Python-3.7.0 src
-cd src
-
-./configure --prefix=$OUT_PREFIX --with-ensurepip=no
-make
-make install
-
-# Remove unneeded test directories, similar to the official Docker Python images:
-# https://github.com/docker-library/python
-find "${OUT_PREFIX}" \( -type d -a \( -name test -o -name tests \) \) -exec rm -rf '{}' +
-
-ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
--- a/Show More
+++ b/Show More