Created
March 12, 2026 04:33
-
-
Save mypy-play/23d692cb9e92b3b4b694050a19f4023b to your computer and use it in GitHub Desktop.
Shared via mypy Playground
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| from typing import TypeVar, Generic | |
| from collections.abc import Callable | |
| BaseExcT_co = TypeVar("BaseExcT_co", bound=BaseException, covariant=True) | |
| BaseExcT_co_default = TypeVar( | |
| "BaseExcT_co_default", bound=BaseException, covariant=True, default=BaseException | |
| ) | |
| class RaisesExc(Generic[BaseExcT_co_default]): | |
| def __init__( | |
| self, | |
| expected_exception: ( | |
| type[BaseExcT_co_default] | tuple[type[BaseExcT_co_default], ...] | |
| ), | |
| /, | |
| *, | |
| check: Callable[[BaseExcT_co_default], bool] | None = ..., | |
| ) -> None: ... | |
| class RaisesGroup(Generic[BaseExcT_co]): | |
| def __init__( | |
| self, | |
| expected_exception: RaisesExc[BaseExcT_co], | |
| /, | |
| *other_exceptions: RaisesExc[BaseExcT_co], | |
| check: Callable[[BaseExceptionGroup[BaseExcT_co]], bool] | None = None, | |
| ) -> None: ... | |
| def foo() -> None: | |
| def check(exc: ValueError) -> bool: | |
| return True | |
| RaisesGroup( | |
| RaisesExc(RuntimeError), | |
| RaisesExc(ValueError, check=check), # error | |
| ) | |
| RaisesGroup( | |
| RaisesExc(RuntimeError), | |
| _re := RaisesExc(ValueError, check=check), # no error | |
| ) | |
| # no error | |
| re = RaisesExc(ValueError, check=check) | |
| RaisesGroup( | |
| RaisesExc(RuntimeError), | |
| re, # no error | |
| ) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment