The DevOps division are heavy users of the Python programming language for backend work.
We do not maintain a style guide but Google's guide is a good starting point.
Most of our Python code is set up to automatically check Python code for PEP8 compliance. We use the default set of rules for flake8 except that we relax the maximum line length to 99 characters. (This being the maximum allowed by PEP8.)
Use unit testing to check functionality of code. Sometimes, the use of doctest is useful for functions which are private to a module. Generally, we use the Django test runner provided by the boilerplate application.
Test code coverage is reported in most of our code and a minimal code coverage level is enforced for most of our repositories. New code should usually be accompanied by tests which exercise the code.