I am a fan of the Sublime text editor. When developing in Python, I have found it useful to have PEP8 and Pyflakes checks in the editor. After trying several packages, I have settled on the Flake8 linter. It provides intelligent marking of problems in my Python code.
To install, assuming you have Package Control already installed in Sublime, select:
Tools > Command Palette… > Install Package > Python Flake8 Lint
Customization is available through the normal package user settings method.