pep8 and pyflakes are forcing standard layout and indicate e.g. unreferenced imports. When code is pep8 compliant there are tools that can do more analysis on the python code. furthermore code reviews become easier as some standard things are "fixed"
There are also some tools like autopep8 that fixes things automagically. check - https://pypi.python.org/pypi/autopep8/ -
Learned that myself some years ago during a very good Python course - https://www.enthought.com/services/training/scientific -