A nice emacs trick : using flymake-mode and this python code styles PEP8 checker script written by Johann C. Rocholl, we can have automatic real time checking for standard python coding style.
To make this work I copied the script (pep8.py) in my PATH, and then I added this block of code in my .emac file :
(when (load "flymake" t)
(defun flymake-pylint-init ()
(let* ((temp-file (flymake-init-create-temp-buffer-copy
(list "pep8.py" (list "--repeat" local-file))))
After this I can just enable flymake mode when I edit a python file, and every coding style error will be highlighted on the fly.