"object" not callable from functools.partial(print, file=...)

[mgedmin]

This feels like a bug to me:

import functools
from typing import Optional, TextIO


def report(file: Optional[TextIO]) -> None:
    print_ = functools.partial(print, file=file) if file is not None else print
    print_("hello")

mypy reports

mypy_partial_print.py:7: error: "object" not callable

I would expect it to accept the code.

mypy version is 0.770. git master (commit 273a865) reports the same error.

Note that mypy accepts slight variations, e.g.

def report(file: TextIO) -> None:
    print_ = functools.partial(print, file=file)
    print_("hello")

is fine.

reveal_type(print_) in the original example says it's a builtins.object. It looks like mypy cannot reconcile a function with its own partial application.

[mgedmin]

Hm, this looked different enough from #1484 that I decided to report it as a separate issue, but now I've found #2779 which is similar enough to be a duplicate, and I see that it was closed in favor of #1484.

[JukkaL]

This is basically the same issue as #2779. Closing as duplicate.