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don't pass through -p if using the default version by asottile · Pull Request #1617 · pre-commit/pre-commit · GitHub

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don't pass through -p if using the default version #1617

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Merged
asottile merged 1 commit into from
Sep 24, 2020
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don't pass through -p if using the default version #1617

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16 changes: 8 additions & 8 deletions pre_commit/languages/python.py
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Original file line number Diff line number Diff line change
Expand Up @@ -132,13 +132,11 @@ def _sys_executable_matches(version: str) -> bool:
return sys.version_info[:len(info)] == info


def norm_version(version: str) -> str:
if version == C.DEFAULT:
return os.path.realpath(sys.executable)

# first see if our current executable is appropriate
if _sys_executable_matches(version):
return sys.executable
def norm_version(version: str) -> Optional[str]:
if version == C.DEFAULT: # use virtualenv's default
return None
elif _sys_executable_matches(version): # virtualenv defaults to our exe
return None

if os.name == 'nt': # pragma: no cover (windows)
version_exec = _find_by_py_launcher(version)
Expand Down Expand Up @@ -194,8 +192,10 @@ def install_environment(
additional_dependencies: Sequence[str],
) -> None:
envdir = prefix.path(helpers.environment_dir(ENVIRONMENT_DIR, version))
venv_cmd = [sys.executable, '-mvirtualenv', envdir]
python = norm_version(version)
venv_cmd = (sys.executable, '-mvirtualenv', envdir, '-p', python)
if python is not None:
venv_cmd.extend(('-p', python))
install_cmd = ('python', '-mpip', 'install', '.', *additional_dependencies)

with clean_path_on_failure(envdir):
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3 changes: 2 additions & 1 deletion tests/languages/python_test.py
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Expand Up @@ -36,13 +36,14 @@ def test_norm_version_expanduser():


def test_norm_version_of_default_is_sys_executable():
assert python.norm_version('default') == os.path.realpath(sys.executable)
assert python.norm_version('default') is None


@pytest.mark.parametrize('v', ('python3.6', 'python3', 'python'))
def test_sys_executable_matches(v):
with mock.patch.object(sys, 'version_info', (3, 6, 7)):
assert python._sys_executable_matches(v)
assert python.norm_version(v) is None


@pytest.mark.parametrize('v', ('notpython', 'python3.x'))
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