dmypy gives errors that mypy does not give, also the error makes no sense

[johnfn]

Bug Report

When running dmypy I get this error sometimes:

Linting...
Function is missing a type annotation

>>> 78 class ApplicationDataBaseApplicationModel):

This doesn't make sense for two reasons:

• mypy does not ever error on this line
• There is no function on this line, let alone an unannotated one

The surrounding code looks like this:

class SomeReturnType:
    ...

def my_function(team_id: int, job_id: int) -> type[SomeReturnType]:
    # do some initial work, set some variables etc

    class ApplicationData(BaseApplicationModel):
        # ... more class properties here

To Reproduce

Can't say exactly because dmypy doesn't always give an error.

Expected Behavior

No error.

Your Environment

• Mypy version used: v1.15
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files): see my previous issues
• Python version used: 3.11

[A5rocks]

Notably you're using the pydantic plugin, which I suspect is causing some issue. It's likely creating an __init__ or something marked as the same location as the class, which mypy then checks.

Not sure why mypy vs dmypy differ though.

[johnfn]

Thanks, that's a useful tip!

[sterliakov]

I understand that you can't provide a standalone code reproducer, but please provide at least some details: how do you invoke dmypy, what's the actual CLI command you are running? dmypy doesn't produce the linting line (grepping for "linting" in mypy repo finds nothing), and error message has a weird shape. Is there any other tool involved?