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Improve documentation for consider-alternative-union-syntax / R6003 (#10044)
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‎doc/data/messages/c/consider-alternative-union-syntax/bad.py

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from typing import Union
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from typing import Optional, Union
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cats: Union[int, str] # [consider-alternative-union-syntax]
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def forecast(
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temp: Union[int, float], # [consider-alternative-union-syntax]
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unit: Optional[str], # [consider-alternative-union-syntax]
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) -> None:
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print(f'Temperature: {temp}{unit or ""}')

‎doc/data/messages/c/consider-alternative-union-syntax/details.rst

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Using the shorthand syntax for union types is |recommended over the typing module|__. This is consistent with the broader recommendation to prefer built-in types over imports (for example, using ``list`` instead of the now-deprecated ``typing.List``).
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``typing.Optional`` can also cause confusion in annotated function arguments, since an argument annotated as ``Optional`` is still a *required* argument when a default value is not set. Explicitly annotating such arguments with ``type | None`` makes the intention clear.
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.. |recommended over the typing module| replace:: recommended over the ``typing`` module
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__ https://docs.python.org/3/library/typing.html#typing.Union

‎doc/data/messages/c/consider-alternative-union-syntax/good.py

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cats: int | str
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def forecast(temp: int | float, unit: str | None) -> None:
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print(f'Temperature: {temp}{unit or ""}')

‎doc/user_guide/checkers/extensions.rst

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:consider-using-alias (R6002): *'%s' will be deprecated with PY39, consider using '%s' instead%s*
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Only emitted if 'runtime-typing=no' and a deprecated typing alias is used in
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a type annotation context in Python 3.7 or 3.8.
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:consider-alternative-union-syntax (R6003): *Consider using alternative Union syntax instead of '%s'%s*
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Emitted when 'typing.Union' or 'typing.Optional' is used instead of the
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alternative Union syntax 'int | None'.
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:consider-alternative-union-syntax (R6003): *Consider using alternative union syntax instead of '%s'%s*
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Emitted when ``typing.Union`` or ``typing.Optional`` is used instead of the
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shorthand union syntax. For example, ``Union[int, float]`` instead of ``int |
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float``. Using the shorthand for unions aligns with Python typing
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recommendations, removes the need for imports, and avoids confusion in
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function signatures.
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:unnecessary-default-type-args (R6007): *Type `%s` has unnecessary default type args. Change it to `%s`.*
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Emitted when types have default type args which can be omitted. Mainly used
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for `typing.Generator` and `typing.AsyncGenerator`.

‎pylint/extensions/typing.py

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"Python 3.7 or 3.8.",
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),
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"R6003": (
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"Consider using alternative Union syntax instead of '%s'%s",
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"Consider using alternative union syntax instead of '%s'%s",
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"consider-alternative-union-syntax",
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"Emitted when 'typing.Union' or 'typing.Optional' is used "
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"instead of the alternative Union syntax 'int | None'.",
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"Emitted when ``typing.Union`` or ``typing.Optional`` is used "
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"instead of the shorthand union syntax. For example, "
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"``Union[int, float]`` instead of ``int | float``. Using "
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"the shorthand for unions aligns with Python typing "
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"recommendations, removes the need for imports, and avoids "
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"confusion in function signatures.",
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),
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"E6004": (
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"'NoReturn' inside compound types is broken in 3.7.0 / 3.7.1",

‎tests/functional/ext/typing/typing_consider_using_union.txt

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consider-alternative-union-syntax:19:6:19:11::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:20:11:20:16::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:21:16:21:28::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:22:6:22:14::Consider using alternative Union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:30:10:30:18:func1:Consider using alternative Union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:31:24:31:29:func1:Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:32:5:32:10:func1:Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:44:12:44:17:CustomNamedTuple:Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:49:27:49:32:CustomTypedDict2:Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:53:12:53:20:CustomDataClass:Consider using alternative Union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:19:6:19:11::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:20:11:20:16::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:21:16:21:28::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:22:6:22:14::Consider using alternative union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:30:10:30:18:func1:Consider using alternative union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:31:24:31:29:func1:Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:32:5:32:10:func1:Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:44:12:44:17:CustomNamedTuple:Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:49:27:49:32:CustomTypedDict2:Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:53:12:53:20:CustomDataClass:Consider using alternative union syntax instead of 'Optional':INFERENCE

‎tests/functional/ext/typing/typing_consider_using_union_py310.txt

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consider-alternative-union-syntax:11:6:11:11::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:12:11:12:16::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:13:16:13:28::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:14:6:14:14::Consider using alternative Union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:16:9:16:14::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:17:14:17:19::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:18:19:18:31::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:19:9:19:17::Consider using alternative Union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:22:10:22:18:func1:Consider using alternative Union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:23:24:23:29:func1:Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:24:5:24:10:func1:Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:27:19:27:24:Custom1:Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:31:28:31:33::Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:33:14:33:22::Consider using alternative Union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:36:12:36:17:CustomNamedTuple:Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:38:56:38:64::Consider using alternative Union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:41:27:41:32:CustomTypedDict2:Consider using alternative Union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:45:12:45:20:CustomDataClass:Consider using alternative Union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:11:6:11:11::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:12:11:12:16::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:13:16:13:28::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:14:6:14:14::Consider using alternative union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:16:9:16:14::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:17:14:17:19::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:18:19:18:31::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:19:9:19:17::Consider using alternative union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:22:10:22:18:func1:Consider using alternative union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:23:24:23:29:func1:Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:24:5:24:10:func1:Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:27:19:27:24:Custom1:Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:31:28:31:33::Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:33:14:33:22::Consider using alternative union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:36:12:36:17:CustomNamedTuple:Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:38:56:38:64::Consider using alternative union syntax instead of 'Optional':INFERENCE
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consider-alternative-union-syntax:41:27:41:32:CustomTypedDict2:Consider using alternative union syntax instead of 'Union':INFERENCE
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consider-alternative-union-syntax:45:12:45:20:CustomDataClass:Consider using alternative union syntax instead of 'Optional':INFERENCE

‎tests/functional/ext/typing/typing_consider_using_union_without_future.txt

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consider-alternative-union-syntax:17:6:17:11::Consider using alternative Union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:18:11:18:16::Consider using alternative Union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:19:16:19:28::Consider using alternative Union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:20:6:20:14::Consider using alternative Union syntax instead of 'Optional'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:28:10:28:18:func1:Consider using alternative Union syntax instead of 'Optional'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:29:24:29:29:func1:Consider using alternative Union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:30:5:30:10:func1:Consider using alternative Union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:42:12:42:17:CustomNamedTuple:Consider using alternative Union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:47:27:47:32:CustomTypedDict2:Consider using alternative Union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:51:12:51:20:CustomDataClass:Consider using alternative Union syntax instead of 'Optional'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:17:6:17:11::Consider using alternative union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:18:11:18:16::Consider using alternative union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:19:16:19:28::Consider using alternative union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:20:6:20:14::Consider using alternative union syntax instead of 'Optional'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:28:10:28:18:func1:Consider using alternative union syntax instead of 'Optional'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:29:24:29:29:func1:Consider using alternative union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:30:5:30:10:func1:Consider using alternative union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:42:12:42:17:CustomNamedTuple:Consider using alternative union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:47:27:47:32:CustomTypedDict2:Consider using alternative union syntax instead of 'Union'. Add 'from __future__ import annotations' as well:INFERENCE
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consider-alternative-union-syntax:51:12:51:20:CustomDataClass:Consider using alternative union syntax instead of 'Optional'. Add 'from __future__ import annotations' as well:INFERENCE

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