Forbid self import

[sobolevn]

Rule request

Thesis

Modules can actually import self. Like this:

# ex.py
import ex

print(ex)

Running:

» python ex.py
<module 'ex' from '/Users/sobolev/Documents/github/wemake-python-styleguide/ex.py'>
<module 'ex' from '/Users/sobolev/Documents/github/wemake-python-styleguide/ex.py'>

Reasoning

This is useless and can be error-prone.
See import-self from http://pylint.pycqa.org/en/latest/technical_reference/features.html

[sobolevn]

Some people use src/, some people patch PATH, some sys.modules.
We won't detect a lot of cases. Moreover, it is not a common mistake. Closing.