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TypedDict as default_factory in dataclasses is not inferred correctly #5723
Description
- Are you reporting a bug, or opening a feature request? bug
- Please insert below the code you are checking with mypy,
or a mock-up repro if the source is private. We would appreciate
if you try to simplify your case to a minimal repro.
from dataclasses import dataclass, field
from mypy_extensions import TypedDict
class Person(TypedDict, total=False):
name: str
@dataclass
class Job:
person: Person = field(default_factory=Person)- What is the actual behavior/output?
main.py:9: error: Incompatible types in assignment (expression has type "main.Person", variable has type "Person")
- What is the behavior/output you expect? To pass
- What are the versions of mypy and Python you are using? latest
Do you see the same issue after installing mypy from Git master? yes - What are the mypy flags you are using? (For example --strict-optional) none
Activity
[-]TypedDict as default_factory in dataclasses are not inferred correctly[/-][+]TypedDict as default_factory in dataclasses is not inferred correctly[/+]ilevkivskyi commentedon Oct 3, 2018
This is actually not specific to dataclasses. It looks like typed dict class objects are never analyzed properly. There is a hack in
visit_call_exprin type checker, that checks them specially, but if they appear in any other context, the correspondingCallableTypeis not created correctly.tsangwpx commentedon Nov 4, 2023
In mypy 1.6.1, the output is
workaround:
Refactor/unify access to static attributes (python#19254)