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.
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.
PyCharm - Python & Django IDE with intelligent code completion, on-the-fly error checking, quick-fixes, and much more...
PEP 257 - Python PEP 257 docstring style checker.
PyChecker - Python source code checking tool.