PEP8
pep8 is a tool to check your Python code against some of the style conventions in PEP 8.
7 Alternatives To PEP8
Coala
Linting and fixing code for all languages
Codacy
Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
PyChecker
Python source code checking tool.
PyFlakes
A simple program which checks Python source files for errors.
PyLint
Pylint is a Python source code analyzer which looks for programming errors.
QuantifiedCode
The first platform for automated code review AND repair
SideCI
SideCI is static code analysis Continous Integration service. Driven by GitHub Pull Requests, Analyze And Comment Violation Automatically. Supports Ruby, PHP, and JavaScript.