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Bad error message when inheriting from Generic multiple times #104328

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JelleZijlstra opened this issue May 9, 2023 · 0 comments
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Bad error message when inheriting from Generic multiple times #104328

JelleZijlstra opened this issue May 9, 2023 · 0 comments
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topic-typing type-bug An unexpected behavior, bug, or error

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@JelleZijlstra
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JelleZijlstra commented May 9, 2023 •
edited by bedevere-bot
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>>> from typing import Generic, TypeVar
>>> T = TypeVar("T")
>>> U = TypeVar("U")
>>> class X(Generic[T], Generic[U]): pass
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/jelle/py/cpython/Lib/typing.py", line 1088, in _generic_init_subclass
    raise TypeError(
TypeError: Cannot inherit from Generic[...] multiple types.

Should say "multiple times".

Noticed by @carljm in #103764 (comment).

Linked PRs
@JelleZijlstra JelleZijlstra added type-bug An unexpected behavior, bug, or error topic-typing labels May 9, 2023
@JelleZijlstra JelleZijlstra mentioned this issue May 9, 2023
Merged
@bedevere-bot bedevere-bot mentioned this issue May 9, 2023
Merged
carljm pushed a commit that referenced this issue May 9, 2023
@Eclips4
gh-104328: Fix typo in typing.Generic multiple inheritance error …
01c321c 
…message (#104335)
@bedevere-bot bedevere-bot mentioned this issue May 9, 2023
Merged
miss-islington pushed a commit to miss-islington/cpython that referenced this issue May 9, 2023
@Eclips4 @miss-islington
pythongh-104328: Fix typo in typing.Generic multiple inheritance …
528cc01 
…error message (pythonGH-104335)

(cherry picked from commit 01c321c)

Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
AlexWaygood pushed a commit that referenced this issue May 9, 2023
@miss-islington @Eclips4
[3.11] gh-104328: Fix typo in typing.Generic multiple inheritance…
663b321 
… error message (GH-104335) (#104338)

gh-104328: Fix typo in ``typing.Generic`` multiple inheritance error message (GH-104335)
(cherry picked from commit 01c321c)

Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
@carljm carljm closed this as completed May 9, 2023
carljm added a commit to carljm/cpython that referenced this issue May 10, 2023
@carljm
Merge branch 'main' into fixloadsuperspec
5976df9 
* main:
  pythonGH-102181: Improve specialization stats for SEND (pythonGH-102182)
  pythongh-103000: Optimise `dataclasses.asdict` for the common case (python#104364)
  pythongh-103538: Remove unused TK_AQUA code (pythonGH-103539)
  pythonGH-87695: Fix OSError from `pathlib.Path.glob()` (pythonGH-104292)
  pythongh-104263: Rely on Py_NAN and introduce Py_INFINITY (pythonGH-104202)
  pythongh-104010: Separate and improve docs for `typing.get_origin` and `typing.get_args` (python#104013)
  pythongh-101819: Adapt _io._BufferedIOBase_Type methods to Argument Clinic (python#104355)
  pythongh-103960: Dark mode: invert image brightness (python#103983)
  pythongh-104252: Immortalize Py_EMPTY_KEYS (pythongh-104253)
  pythongh-101819: Clean up _io windows console io after pythongh-104197 (python#104354)
  pythongh-101819: Harden _io init (python#104352)
  pythongh-103247: clear the module cache in a test in test_importlib/extensions/test_loader.py (pythonGH-104226)
  pythongh-103848: Adds checks to ensure that bracketed hosts found by urlsplit are of IPv6 or IPvFuture format (python#103849)
  pythongh-74895: adjust tests to work on Solaris (python#104326)
  pythongh-101819: Refactor _io in preparation for module isolation (python#104334)
  pythongh-90953: Don't use deprecated AST nodes in clinic.py (python#104322)
  pythongh-102327: Extend docs for "url" and "headers" parameters to HTTPConnection.request()
  pythongh-104328: Fix typo in ``typing.Generic`` multiple inheritance error message (python#104335)
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