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markedwards opened this issue Apr 4, 2021 · 9 comments
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PEP 612 support #794

markedwards opened this issue Apr 4, 2021 · 9 comments

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@markedwards
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Is there a schedule for adding support for PEP 612 (ParamSpec) to typing_extensions?
@JelleZijlstra
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There is an open pull request: #774.

@markedwards
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Thanks for the pointer @JelleZijlstra

@gvanrossum
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gvanrossum commented Apr 5, 2021 via email

@JelleZijlstra
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I will, I can ping you once I'm happy with it.

@JelleZijlstra
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This has now been merged.

@markedwards
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Thanks!

@markedwards
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markedwards commented Oct 23, 2021 •
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Following up on this, running mypy 0.910 and typing-extensions 3.10.0.2, I get errors with the documentation example for ParamSpec:

import logging
from collections.abc import Callable
from typing import TypeVar

from typing_extensions import ParamSpec

T = TypeVar('T')
P = ParamSpec('P')


def add_logging(f: Callable[P, T]) -> Callable[P, T]:
# mypy complains for the above line:
#     The first argument to Callable must be a list of types or "..."

    def inner(*args: P.args, **kwargs: P.kwargs) -> T:
    # mypy complains for the above line:
    #     Name "P.args" is not defined
    #     Name "P.kwargs" is not defined
        logging.info(f'{f.__name__} was called')
        return f(*args, **kwargs)
    return inner

Is it not possible to use ParamSpec in python 3.9?

@srittau
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srittau commented Oct 23, 2021

mypy 0.910 doesn't support ParamSpec yet.

@markedwards
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@srittau Thanks, I see python/mypy#8645 now

4D87
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@srittau @markedwards @JelleZijlstra @gvanrossum
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