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gh-126699: allow AsyncIterator to be used as a base for Protocols #126702

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Nov 12, 2024
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gh-126699: allow AsyncIterator to be used as a base for Protocols #126702

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6eea0a1
allow AsyncIterator to be used as a base for Protocols
tungol Nov 11, 2024
7c82b92
Update Misc/NEWS.d/next/Library/2024-11-11-13-24-22.gh-issue-126699.O…
tungol Nov 11, 2024
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3 changes: 3 additions & 0 deletions Lib/test/test_typing.py
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Expand Up @@ -4255,6 +4255,9 @@ class CustomProtocol(TestCase, Protocol):
class CustomContextManager(typing.ContextManager, Protocol):
pass

class CustomAsyncIterator(typing.AsyncIterator, Protocol):
pass

def test_non_runtime_protocol_isinstance_check(self):
class P(Protocol):
x: int
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3 changes: 2 additions & 1 deletion Lib/typing.py
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Expand Up @@ -1940,7 +1940,8 @@ def _allow_reckless_class_checks(depth=2):
_PROTO_ALLOWLIST = {
'collections.abc': [
'Callable', 'Awaitable', 'Iterable', 'Iterator', 'AsyncIterable',
'Hashable', 'Sized', 'Container', 'Collection', 'Reversible', 'Buffer',
'AsyncIterator', 'Hashable', 'Sized', 'Container', 'Collection',
'Reversible', 'Buffer',
],
'contextlib': ['AbstractContextManager', 'AbstractAsyncContextManager'],
}
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2024-11-11-13-24-22.gh-issue-126699.ONGbMd.rst
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@@ -0,0 +1 @@
Allow :class:`collections.abc.AsyncIterator` to be a base for Protocols.
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