This package adds support for pyflakes to flycheck. To use it, add to your init.el: (require 'flycheck-pyflakes) (add-hook 'python-mode-hook 'flycheck-mode) If you want to use pyflakes you probably don't want pylint or flake8. To disable those checkers, add the following to your init.el: (add-to-list 'flycheck-disabled-checkers 'python-flake8) (add-to-list 'flycheck-disabled-checkers 'python-pylint)