heroku-buildpack-python/bin/steps/pip-install

#!/usr/bin/env bash

if [ ! "$SKIP_PIP_INSTALL" ]; then

    # Install dependencies with Pip.
    puts-step "Installing requirements with pip"

    set +e
    /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]}"
    set -e

    show-warnings

    if [[ ! $PIP_STATUS -eq 0 ]]; 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
fi