Bug: Functional Enum API Unexpected arguments to Enum()

[xylix]

I get error

enum-repro.py:3: error: Unexpected arguments to Enum()
Found 1 error in 1 file (checked 1 source file)

When mypy checking for example

from enum import Enum

enum_name = Enum(
    value="enum_name",
    names={
        "a": 1,
        "b": 2
    }
)
print(enum_name)

I'm using mypy 0.782 and Python 3.8.3. Also tried latest master (0.790+dev.eae1860bef0a6fe06753459bf97633a41e789ed7)

Since this is valid python3 syntax, I would expect mypy to at least let it through, maybe with a warning about dynamic types being impossible to infer at static typecheck time.

For my actual use case, I could try using the class EnumName(Enum)): form but It doesn't fully support my use case, because I would like to use names containing spaces and special symbols.

[JelleZijlstra]

This should work if you use positional instead of keyword arguments. For example, the mypy test suite contains a E = Enum('E', {'foo': 1, 'bar': 2}). It wouldn't be hard to support keyword arguments (feel free to submit a PR!), but we just haven't taken the time to implement it.

[xylix]

Okay great, I understand that specifically not being implemented. The unnamed arguments will do as a workaround for now, solves my use case.

[LiuYuHui]

hi, @JukkaL @JelleZijlstra I want to fix this issue, could you please give some suggestions about where to start?

[JelleZijlstra]

@LiuYuHui you can add new test cases to the check-enum.test file. The implementation would probably go in the parse_enum_call_args method in semanal_enum.py.

[charnugagoo]

I am having the same issue.