Type check error with asdict (2)

[dnlfm]

Running MyPy for the following code:

from typing import Any
import attr

@attr.s(auto_attribs=True, kw_only=True, slots=True)
class MyClass:
    x: int

def my_serializer(record: Any, k: attr.Attribute, v: Any) -> Any:
    return v

m = MyClass(x=1)
k = attr.asdict(m, value_serializer=my_serializer)
print(k)

generates the error:

error: Argument 1 to "asdict" has incompatible type "MyClass"; expected "AttrsInstance"

Related to: #987

Versions:

• attrs==23.1.0
• mypy==0.812

[Tinche]

Can you try Mypy 1.3.0?

[dnlfm]

@Tinche With MyPy 1.3.0 it works. Is it necessary to update MyPy to work with newer versions of attrs?

[Tinche]

Yes, both the attrs plugin and Mypy itself is developing very rapidly, so I always recommend using the latest version if you can.

[dnlfm]

Unfortunately updating MyPy to 1.3.0 introduces other issues... I think I'll just skip it for now. Thank you anyway!