no error when subscripting AbstractContextManager when targeting python 3.8 #16097

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1. DetachHead

   added

   bugmypy got something wrongmypy got something wrong

   on Sep 13, 2023
2. KotlinIsland commented on Sep 13, 2023

   

   KotlinIsland

   on Sep 13, 2023

   Contributor

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   • caused by: (🎁) Add a StubOnlyBase decorator for types that don't actually extend things, but do in the stubs (like Generic) typing#956

   The easiest way to handle this situation would be to special case it.
3. AlexWaygood

   added

   topic-pep-585PEP 585 (builtin generics)PEP 585 (builtin generics)

   on Sep 13, 2023
4. Avasam commented on May 18, 2026

   

   Avasam

   on May 18, 2026

   Last edited by Avasam

   SponsorContributor

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   mypy 1.17 has dropped support for Python 3.8:

   • Drop support for --python-version 3.8 #19157
   • https://mypy-lang.blogspot.com/2025/07/mypy-117-released.html#:~:text=Remove%20Support%20for%20Targeting%20Python%203.8

   and mypy 2.0 has dropped support for Python 3.9:

   • Drop support for --python-version 3.9 #21243
   • https://mypy-lang.blogspot.com/2026/05/mypy-20-relased.html#:~:text=Drop%20Support%20for%20Targeting%20Python%203.9

   So this specific case of subscripting contextlib.AbstractContextManager should be valid on all supported Python versions
5. JelleZijlstra

   closed this as completedon May 18, 2026