epylint -- use pylint with emacs, with google app engine in path

epylint.py

#!/usr/bin/env python
    
import re
import sys
    
from subprocess import *
PYTHONPATH = check_output('/usr/bin/find /Applications/GoogleAppEngineLauncher.app//Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/ -depth 1 -type d -exec /bin/echo -n "{}:" \;', shell=True)
PYTHONPATH += '/Applications/GoogleAppEngineLauncher.app//Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/';

p = Popen(["/usr/local/bin/pylint","-fparseable","-rn","--disable=C,R",
	sys.argv[1]],
	stdout = PIPE,
	env = {"PYTHONPATH": PYTHONPATH}
	).stdout
    
for line in p:
    match = re.search("\\[([WE])(, (.+?))?\\]", line)
    if match:
        kind = match.group(1)
        func = match.group(3)

        if kind == "W":
            msg = "Warning"
        else:
            msg = "Error"
    
        if func:
            line = re.sub("\\[([WE])(, (.+?))?\\]",
                          "%s (%s):" % (msg, func), line)
        else:
            line = re.sub("\\[([WE])?\\]", "%s:" % msg, line)
    print line,
    
p.close()

init.el

(when (load "flymake" t)
  (defun flymake-pylint-init ()
    (let* ((temp-file (flymake-init-create-temp-buffer-copy
		       'flymake-create-temp-inplace))
           (local-file (file-relative-name
                        temp-file
                        (file-name-directory buffer-file-name))))
      (list "~/Dropbox/bin/epylint.py" (list local-file))))
  
  (add-to-list 'flymake-allowed-file-name-masks
               '("\\.py\\'" flymake-pylint-init))
  
)

(add-hook 'python-mode-hook
	  (lambda () (flymake-mode t)))

Inspiration and blatant copying from http://emacswiki.org/emacs/PythonProgrammingInEmacs