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Type-check on all Python versions #4352

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Aug 21, 2024
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Type-check on all Python versions #4352

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14 changes: 9 additions & 5 deletions mypy.ini
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
[mypy]
# CI should test for all versions, local development gets hints for oldest supported
# Some upstream typeshed distutils stubs fixes are necessary before we can start testing on Python 3.12
python_version = 3.8
# But our testing setup doesn't allow passing CLI arguments, so local devs have to set this manually.
# python_version = 3.8
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Would love if there was a way to tell the CI to pass the --python-version argument to override this config so that IDEs and maybe default local runs can test against the oldest supported Python version.

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pytest-mypy mentions the following:

Mypy supports reading configuration settings from a mypy.ini file. Alternatively, the plugin can be configured in a conftest.py to invoke mypy with extra options:

def pytest_configure(config):
    plugin = config.pluginmanager.getplugin('mypy')
    plugin.mypy_argv.append('--check-untyped-defs')

Not sure if that is useful to achieve what you want via conftest.py.

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@Avasam Avasam Aug 21, 2024 •
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I think it would, something like:

import sys

def pytest_configure(config):
    plugin = config.pluginmanager.getplugin('mypy')
    plugin.mypy_argv.append(f'--python-version={sys.version_info.major}.{sys.version_info.minor}')

Since you approved, mind if I tackle your comments in a follow-up ?

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@abravalheri abravalheri Aug 21, 2024 •
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Since you approved, mind if I tackle your comments in a follow-up ?

Sure!

plugin.mypy_argv.append(f'--python-version={sys.version_info.major}.{sys.version_info.minor}')

Is that going to behave differently than just omitting python_version in mypy.ini?

pytest-mypy would force the contributor to check on the current version anyway, right?

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@Avasam Avasam Aug 21, 2024 •
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Honestly, I never run pytest-mypy locally. But yes that would mean that the mypy-test commands would always check for the executed Python. A more complete snippet of code would probably check if this is being run on the CI (check for GitHub env var) and whether the dev already passed --python-version as to not overwrite it (let's say they run pytest-mypy directly w/o tox)

strict = False
warn_unused_ignores = True
warn_redundant_casts = True
Expand Down Expand Up @@ -30,15 +30,19 @@ disable_error_code = attr-defined
[mypy-pkg_resources.tests.*]
disable_error_code = import-not-found

# - distutils._modified has different errors on Python 3.8 [import-untyped], on Python 3.9+ [import-not-found]
# - distutils doesn't exist on Python 3.12, unfortunately, this means typing
# will be missing for subclasses of distutils on Python 3.12 until either:
# - support for `SETUPTOOLS_USE_DISTUTILS=stdlib` is dropped (#3625)
# for setuptools to import `_distutils` directly
# - or non-stdlib distutils typings are exposed
Comment on lines +35 to +37
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@Avasam Avasam Aug 10, 2024 •
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This includes potentially moving _distutils to a path where the last folder ends in distutils so it can be added to the MYPY_PATH. (although that only helps setuptool's own development, not its downstream Python 3.12+ users)

Or typeshed accepting to publish a non-stdlib types-distutils

Until then, Python 3.12+ users won't be able to have complete typing without types-setuptools (which already provides distutils-stubs https://github.com/python/typeshed/tree/main/stubs/setuptools/distutils) since anything inheriting or re-exported from distutils will be typed as Any.

Anyway, not a huge concern just yet, but something to start thinking about.

# - All jaraco modules are still untyped
# - _validate_project sometimes complains about trove_classifiers (#4296)
# - wheel appears to be untyped
[mypy-distutils._modified,jaraco.*,trove_classifiers,wheel.*]
[mypy-distutils.*,jaraco.*,trove_classifiers,wheel.*]
ignore_missing_imports = True

# Even when excluding a module, import issues can show up due to following import
# https://github.com/python/mypy/issues/11936#issuecomment-1466764006
[mypy-setuptools.config._validate_pyproject.*]
[mypy-setuptools.config._validate_pyproject.*,setuptools._distutils.*]
follow_imports = silent
# silent => ignore errors when following imports
11 changes: 9 additions & 2 deletions setuptools/__init__.py
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@@ -1,4 +1,9 @@
"""Extensions to the 'distutils' for large or complex distributions"""
# mypy: disable_error_code=override
# Command.reinitialize_command has an extra **kw param that distutils doesn't have
# Can't disable on the exact line because distutils doesn't exists on Python 3.12
# and mypy isn't aware of distutils_hack, causing distutils.core.Command to be Any,
# and a [unused-ignore] to be raised on 3.12+
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Alternatively:

Suggested change
# Can't disable on the exact line because distutils doesn't exists on Python 3.12
# and mypy isn't aware of distutils_hack, causing distutils.core.Command to be Any,
# and a [unused-ignore] to be raised on 3.12+
# See comment in mypy.ini about distutils on Python 3.12


from __future__ import annotations

Expand Down Expand Up @@ -114,8 +119,10 @@ def setup(**attrs):
setup.__doc__ = distutils.core.setup.__doc__

if TYPE_CHECKING:
from typing_extensions import TypeAlias

# Work around a mypy issue where type[T] can't be used as a base: https://github.com/python/mypy/issues/10962
_Command = distutils.core.Command
_Command: TypeAlias = distutils.core.Command
else:
_Command = monkey.get_unpatched(distutils.core.Command)

Expand Down Expand Up @@ -207,7 +214,7 @@ def ensure_string_list(self, option):
"'%s' must be a list of strings (got %r)" % (option, val)
)

@overload # type:ignore[override] # Extra **kw param
@overload
def reinitialize_command(
self, command: str, reinit_subcommands: bool = False, **kw
) -> _Command: ...
Expand Down
5 changes: 3 additions & 2 deletions setuptools/build_meta.py
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Expand Up @@ -387,9 +387,10 @@ def _build_with_temp_dir(

# Build in a temporary directory, then copy to the target.
os.makedirs(result_directory, exist_ok=True)
temp_opts = {"prefix": ".tmp-", "dir": result_directory}

with tempfile.TemporaryDirectory(**temp_opts) as tmp_dist_dir:
with tempfile.TemporaryDirectory(
prefix=".tmp-", dir=result_directory
) as tmp_dist_dir:
sys.argv = [
*sys.argv[:1],
*self._global_args(config_settings),
Expand Down
2 changes: 1 addition & 1 deletion setuptools/command/build_ext.py
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Expand Up @@ -32,7 +32,7 @@
get_config_var("LDSHARED")
# Not publicly exposed in typeshed distutils stubs, but this is done on purpose
# See https://github.com/pypa/setuptools/pull/4228#issuecomment-1959856400
from distutils.sysconfig import _config_vars as _CONFIG_VARS # type: ignore # noqa
from distutils.sysconfig import _config_vars as _CONFIG_VARS # noqa: E402


def _customize_compiler_for_shlib(compiler):
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4 changes: 3 additions & 1 deletion setuptools/command/sdist.py
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@@ -1,3 +1,5 @@
from __future__ import annotations

import contextlib
import os
from itertools import chain
Expand Down Expand Up @@ -46,7 +48,7 @@ class sdist(orig.sdist):
]

distribution: Distribution # override distutils.dist.Distribution with setuptools.dist.Distribution
negative_opt = {}
negative_opt: dict[str, str] = {}

README_EXTENSIONS = ['', '.rst', '.txt', '.md']
READMES = tuple('README{0}'.format(ext) for ext in README_EXTENSIONS)
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5 changes: 4 additions & 1 deletion setuptools/config/setupcfg.py
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Expand Up @@ -24,9 +24,11 @@
Generic,
Iterable,
Iterator,
List,
Tuple,
TypeVar,
Union,
cast,
)

from packaging.markers import default_environment as marker_env
Expand Down Expand Up @@ -108,7 +110,8 @@ def _apply(
filenames = [*other_files, filepath]

try:
_Distribution.parse_config_files(dist, filenames=filenames) # type: ignore[arg-type] # TODO: fix in distutils stubs
# TODO: Temporary cast until mypy 1.12 is released with upstream fixes from typeshed
_Distribution.parse_config_files(dist, filenames=cast(List[str], filenames))
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python/typeshed@ac8720b#diff-d648cd8f6aa0211e1f3e96439ba4a67ec8b7474fbf0aba2459b894cb5022a0bcR16

handlers = parse_configuration(
dist, dist.command_options, ignore_option_errors=ignore_option_errors
)
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4 changes: 3 additions & 1 deletion setuptools/dist.py
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Expand Up @@ -195,8 +195,10 @@ def check_packages(dist, attr, value):


if TYPE_CHECKING:
from typing_extensions import TypeAlias

# Work around a mypy issue where type[T] can't be used as a base: https://github.com/python/mypy/issues/10962
_Distribution = distutils.core.Distribution
_Distribution: TypeAlias = distutils.core.Distribution
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I think this one we can do:

Suggested change
_Distribution: TypeAlias = distutils.core.Distribution
from distutils.core import Distribution as _Distribution

and remove the import for TypeAlias.

(errors.py should be fine using the TypeAlias though - I am indifferent on the approach for that file).

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Since you already approved and these are changed in #4504 , I'll keep it as-is for this PR

else:
_Distribution = get_unpatched(distutils.core.Distribution)

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41 changes: 24 additions & 17 deletions setuptools/errors.py
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Expand Up @@ -3,29 +3,36 @@
Provides exceptions used by setuptools modules.
"""

from __future__ import annotations

from typing import TYPE_CHECKING

from distutils import errors as _distutils_errors

if TYPE_CHECKING:
from typing_extensions import TypeAlias

# Re-export errors from distutils to facilitate the migration to PEP632

ByteCompileError = _distutils_errors.DistutilsByteCompileError
CCompilerError = _distutils_errors.CCompilerError
ClassError = _distutils_errors.DistutilsClassError
CompileError = _distutils_errors.CompileError
ExecError = _distutils_errors.DistutilsExecError
FileError = _distutils_errors.DistutilsFileError
InternalError = _distutils_errors.DistutilsInternalError
LibError = _distutils_errors.LibError
LinkError = _distutils_errors.LinkError
ModuleError = _distutils_errors.DistutilsModuleError
OptionError = _distutils_errors.DistutilsOptionError
PlatformError = _distutils_errors.DistutilsPlatformError
PreprocessError = _distutils_errors.PreprocessError
SetupError = _distutils_errors.DistutilsSetupError
TemplateError = _distutils_errors.DistutilsTemplateError
UnknownFileError = _distutils_errors.UnknownFileError
ByteCompileError: TypeAlias = _distutils_errors.DistutilsByteCompileError
CCompilerError: TypeAlias = _distutils_errors.CCompilerError
ClassError: TypeAlias = _distutils_errors.DistutilsClassError
CompileError: TypeAlias = _distutils_errors.CompileError
ExecError: TypeAlias = _distutils_errors.DistutilsExecError
FileError: TypeAlias = _distutils_errors.DistutilsFileError
InternalError: TypeAlias = _distutils_errors.DistutilsInternalError
LibError: TypeAlias = _distutils_errors.LibError
LinkError: TypeAlias = _distutils_errors.LinkError
ModuleError: TypeAlias = _distutils_errors.DistutilsModuleError
OptionError: TypeAlias = _distutils_errors.DistutilsOptionError
PlatformError: TypeAlias = _distutils_errors.DistutilsPlatformError
PreprocessError: TypeAlias = _distutils_errors.PreprocessError
SetupError: TypeAlias = _distutils_errors.DistutilsSetupError
TemplateError: TypeAlias = _distutils_errors.DistutilsTemplateError
UnknownFileError: TypeAlias = _distutils_errors.UnknownFileError

# The root error class in the hierarchy
BaseError = _distutils_errors.DistutilsError
BaseError: TypeAlias = _distutils_errors.DistutilsError


class InvalidConfigError(OptionError):
Expand Down
4 changes: 3 additions & 1 deletion setuptools/extension.py
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Expand Up @@ -27,8 +27,10 @@ def _have_cython():
# for compatibility
have_pyrex = _have_cython
if TYPE_CHECKING:
from typing_extensions import TypeAlias

# Work around a mypy issue where type[T] can't be used as a base: https://github.com/python/mypy/issues/10962
_Extension = distutils.core.Extension
_Extension: TypeAlias = distutils.core.Extension
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Suggested change
_Extension: TypeAlias = distutils.core.Extension
from distutils.core import Extension as _Extension

And then we can drop the TypeAlias.

else:
_Extension = get_unpatched(distutils.core.Extension)

Expand Down
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