PyLint - Pylint is a Python source code analyzer which looks for programming errors.
flake8 - A wrapper around Python tools to check the style and quality of Python code.
PyFlakes - A simple program which checks Python source files for errors.
SonarQube - SonarQube, a core component of the Sonar solution, is an open source, self-managed tool that systematically helps developers and organizations deliver Clean Code.
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
PEP 257 - Python PEP 257 docstring style checker.