Comply with PEP8 using flake8 and git pre-commit hooks. It will take just a minute.

Go the base location of your source code and activate your virtualenv if any.

$ pip install flake8 # install flake8

 If you are using git, create a pre-commit hook file
 $ vim .git/hooks/pre-commit

In the file add the below two lines 
 flake8 . 
Now as you try to commit your code it will show you all coding style issues. 
You will only be able to commit until code is pep8 compliant.