stdlib: use bool for annotations where the default is False

[AlexWaygood]

Found by grepping for : int = False

(I also grepped for : int = True, but there weren't any hits.)

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

isort (https://github.com/pycqa/isort)
+ isort/api.py:196: error: No overload variant of "compile" matches argument types "str", "str", "str", "int", "int"  [call-overload]
+ isort/api.py:196: note: Possible overload variants:
+ isort/api.py:196: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, flags: Literal[0], dont_inherit: bool = ..., optimize: int = ..., *, _feature_version: int = ...) -> CodeType
+ isort/api.py:196: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, *, dont_inherit: bool = ..., optimize: int = ..., _feature_version: int = ...) -> CodeType
+ isort/api.py:196: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, flags: Literal[1024], dont_inherit: bool = ..., optimize: int = ..., *, _feature_version: int = ...) -> AST
+ isort/api.py:196: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, flags: int, dont_inherit: bool = ..., optimize: int = ..., *, _feature_version: int = ...) -> Any
+ isort/api.py:223: error: No overload variant of "compile" matches argument types "str", "str", "str", "int", "int"  [call-overload]
+ isort/api.py:223: note: Possible overload variants:
+ isort/api.py:223: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, flags: Literal[0], dont_inherit: bool = ..., optimize: int = ..., *, _feature_version: int = ...) -> CodeType
+ isort/api.py:223: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, *, dont_inherit: bool = ..., optimize: int = ..., _feature_version: int = ...) -> CodeType
+ isort/api.py:223: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, flags: Literal[1024], dont_inherit: bool = ..., optimize: int = ..., *, _feature_version: int = ...) -> AST
+ isort/api.py:223: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, flags: int, dont_inherit: bool = ..., optimize: int = ..., *, _feature_version: int = ...) -> Any

streamlit (https://github.com/streamlit/streamlit)
+ lib/streamlit/runtime/scriptrunner/script_runner.py: note: In member "_run_script" of class "ScriptRunner":
+ lib/streamlit/runtime/scriptrunner/script_runner.py:495:20: error: No overload variant of "compile" matches argument types "Any", "str", "str", "int", "int", "int"  [call-overload]
+ lib/streamlit/runtime/scriptrunner/script_runner.py:495:20: note: Possible overload variants:
+ lib/streamlit/runtime/scriptrunner/script_runner.py:495:20: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, flags: Literal[0], dont_inherit: bool = ..., optimize: int = ..., *, _feature_version: int = ...) -> CodeType
+ lib/streamlit/runtime/scriptrunner/script_runner.py:495:20: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, *, dont_inherit: bool = ..., optimize: int = ..., _feature_version: int = ...) -> CodeType
+ lib/streamlit/runtime/scriptrunner/script_runner.py:495:20: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, flags: Literal[1024], dont_inherit: bool = ..., optimize: int = ..., *, _feature_version: int = ...) -> AST
+ lib/streamlit/runtime/scriptrunner/script_runner.py:495:20: note:     def compile(source: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], Module, Expression, Interactive], filename: Union[str, Union[bytes, Union[bytearray, memoryview, array[Any], mmap, _CData, PickleBuffer]], _PathLike[Any]], mode: str, flags: int, dont_inherit: bool = ..., optimize: int = ..., *, _feature_version: int = ...) -> Any

[AlexWaygood]

It looks like a big fallout because of the verbose error messages, but in actual fact that's only 3 new hits being reported in user code.

I could also just revert the changes to builtins.compile(), however. Curious for other people's thoughts.

[Akuli]

I like the simple defaults in stubs :)

[Akuli]

I think it's fine to get a new mypy error for using an integer as the compile() argument. The documentation of compile() talks about zero and nonzero integers, but was written before Python had a bool type (Python 2.2 docs have the same text).

[AlexWaygood]

Then let's do it.