Cannot import attribute from module of the same name within __init__.py

[Diggsey]

Example:

# __init__.py
from .app import app

mypy will complain about app being defined twice.

[gvanrossum]

Yeah, I can confirm this, with app.py containing

class App:
    pass
app = App()

I'm not sure how easy this is to fix in mypy; I can suggest as a workaround to rename one of the two things named app.

NOTE: Even though this works in Python, it is definitely "skating on thin ice": normally when there's a package P with a submodule M, P's namespace contains a name M referencing the module M. What you're doing here is overwriting that M with another thing also named M and imported from P.M (in your case M == app).

[Diggsey]

If it was purely my own project, I'd avoid it as bad practice. However, this technique seems to be used widely throughout many python packages, including sqlalchemy.

[gvanrossum]

Implementing this will be somewhat tricky. :-(

[ilevkivskyi]

It looks like this is now fixed. I can't reproduce the error.