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Merge pull request #1627 from uranusjr/ask-py

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Ask py.exe for its opinion when choosing a Python
This commit is contained in:
Kenneth Reitz
2018-03-09 04:59:44 -05:00
committed by GitHub
parent 618249fdaa 997b224168
commit b5dbd4597e
1 changed files with 65 additions and 28 deletions
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pipenv/core.py
+65 -28
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@@ -353,40 +353,77 @@ def ensure_pipfile(validate=True, skip_requirements=False):
project.write_toml(p)
def find_python_from_py(python):
"""Find a Python executable from on Windows.
Ask py.exe for its opinion.
"""
py = system_which('py')
if not py:
return None
version_args = ['-{0}'.format(python[0])]
if len(python) >= 2:
version_args.append('-{0}.{1}'.format(python[0], python[2]))
import subprocess
for ver_arg in reversed(version_args):
try:
python_exe = subprocess.check_output([py, ver_arg, '-c', 'import sys; print(sys.executable)'])
except subprocess.CalledProcessError:
continue
if not isinstance(python_exe, str):
python_exe = python_exe.decode(sys.getdefaultencoding())
python_exe = python_exe.strip()
version = python_version(python_exe)
if (version or '').startswith(python):
return python_exe
def find_python_in_path(python):
"""Find a Python executable from a version number.
This uses the PATH environment variable to locate an appropriate Python.
"""
possibilities = [
'python',
'python{0}'.format(python[0]),
]
if len(python) >= 2:
possibilities.extend(
[
'python{0}{1}'.format(python[0], python[2]),
'python{0}.{1}'.format(python[0], python[2]),
'python{0}.{1}m'.format(python[0], python[2])
]
)
# Reverse the list, so we find specific ones first.
possibilities = reversed(possibilities)
for possibility in possibilities:
# Windows compatibility.
if os.name == 'nt':
possibility = '{0}.exe'.format(possibility)
pythons = system_which(possibility, mult=True)
for p in pythons:
version = python_version(p)
if (version or '').startswith(python):
return p
def find_a_system_python(python):
"""Finds a system python, given a version (e.g. 2 / 2.7 / 3.6.2), or a full path."""
if python.startswith('py'):
return system_which(python)
elif os.path.isabs(python):
return python
else:
possibilities = [
'python',
'python{0}'.format(python[0]),
]
if len(python) >= 2:
possibilities.extend(
[
'python{0}{1}'.format(python[0], python[2]),
'python{0}.{1}'.format(python[0], python[2]),
'python{0}.{1}m'.format(python[0], python[2])
]
)
# Reverse the list, so we find specific ones first.
possibilities = reversed(possibilities)
for possibility in possibilities:
# Windows compatibility.
if os.name == 'nt':
possibility = '{0}.exe'.format(possibility)
pythons = system_which(possibility, mult=True)
for p in pythons:
version = python_version(p)
if (version or '').startswith(python):
return p
python_from_py = find_python_from_py(python)
if python_from_py:
return python_from_py
return find_python_in_path(python)
def ensure_python(three=None, python=None):