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Python 3.13: TypedDict.__readonly_keys__ and __mutable_keys__ missing #18810
Description
Bug Report
mypy doesn't synthesize the __readonly_keys__ and __mutable_keys__ class attributes of TypedDict, introduced in Python 3.13. This leads to stubtest complaining about each instance of a TypedDict due to the attributes missing from the stubs.
To Reproduce
# foo.py
from typing import TypedDict
class Foo(TypedDict):
bar: str
print(Foo.__readonly_keys__) # at runtime: frozenset()
print(Foo.__mutable_keys__) # at runtime: frozenset({'bar'})Expected Behavior
Using mypy --python-version 3.13 foo.py: no errors.
Actual Behavior
foo.py:8: error: "type[Foo]" has no attribute "__readonly_keys__" [attr-defined]
foo.py:9: error: "type[Foo]" has no attribute "__mutable_keys__" [attr-defined]
Found 2 errors in 1 file (checked 1 source file)
Your Environment
- Mypy version used: 1.15.0
- Mypy command-line flags: --python-version 3.13
- Mypy configuration options from
mypy.ini(and other config files): ./. - Python version used: 3.12
Activity
Ignore missing TypedDict fields
AlexWaygood commentedon Mar 17, 2025
Ah shoot, now that I look at this again, I think this is a typeshed bug? We should probably be listing these attributes in the
typing._TypedDictstub here: https://github.com/python/typeshed/blob/205e993b52681f14fe38f3790f88e39e7cf3474b/stdlib/typing.pyi#L945-L952same as we do in our stub for
typing_extensionshere: https://github.com/python/typeshed/blob/205e993b52681f14fe38f3790f88e39e7cf3474b/stdlib/typing_extensions.pyi#L225-L227srittau commentedon Mar 17, 2025
Good point, I'll send a PR. That will also make sure that it will work with any Python version.