mypy can't find type defined inside a function.

[asincero]

Steps to reproduce

mypy can't seem to find a class defined inside a function. For example:

import typing

def foo() -> typing.Any:
    class Bar(typing.NamedTuple):
        member: str

    o = Bar(member='fee')
    return o

Current behavior

I get the following when I run mypy on the above code (saved in a file named "t1.py"):

t1.py:4: error: Name 'Bar' is not defined
t1.py:7: error: Missing positional arguments "typename", "fields", "verbose", "rename", "kwargs" in call to "Bar"

Expected behavior

No errors or warning from mypy.

mypy --version output

mypy 0.540

[gvanrossum]

Good catch. It appears subclassing NamedTuple is only recognized at the module level, not inside a function. So your workaround would be to move Bar up to the module level.

[ilevkivskyi]

...or you can just use (less nice) functional form Bar = NamedTuple('Bar', [('member', str)]) which works correctly.

This means that this bug should be easy to fix.

[gvanrossum]

My guess is the bug has to do with some pass not descending into function bodies. We've seen such errors before.

[solomatov]

Are there any updates on this?
I still have it in 0.660

[momohatt]

This doesn't reproduce in 0.782. Maybe it's already fixed?

[97littleleaf11]

I cannot reproduce it in latest version. Seems it had been fixed.