Duplicate module names causes Module has no attribute #8220

This is a bug report. There was a regression recently that caused mypy to start raising error where it did not in the past.

Example:
Save the following code at pathlib.py.

import pathlib

p = pathlib.Path(".")
print(p)

With the latest mypy, this fails.

$ mypy --version
mypy 0.761
$ mypy pathlib.py 
pathlib.py:3: error: Module has no attribute "Path"
Found 1 error in 1 file (checked 1 source file)

However, it used to work:

$ mypy --version
mypy 0.720
$ mypy pathlib.py 
$ 

Note: This code won't run, but I was having trouble making a simple example to reproduce the issue I was seeing. The actually case where this happened does work and was a sub-module within a project that was named the same as a 3rd part module it was wrapping.