pre-commit with pylint written by @fitzgen. You can check the script in http://fitzgeraldnick.com/weblog/9/.

pylint-git-precommit.py

#!/usr/bin/env python

"""
A pre-commit hook for git that uses Pylint for automated code review.
 
If any python file's rating falls below the ``PYLINT_PASS_THRESHOLD``, this
script will return nonzero and the commit will be rejected.
 
This script must be located at ``$REPO/.git/hooks/pre-commit`` and be
executable.

Copyright 2009 Nick Fitzgerald - MIT Licensed.
"""
import os
import re
import sys
 
from subprocess import Popen, PIPE
 
# Threshold for code to pass the Pylint test. 10 is the highest score Pylint
# will give to any peice of code.
PYLINT_PASS_THRESHOLD = 7
 
def main():
    """Checks your git commit with Pylint!"""
    # Run the git command that gets the filenames of every file that has been
    # locally modified since the last commit.
    sub = Popen("git diff --staged --name-only HEAD".split(),
                stdout=PIPE)
    sub.wait()
 
    # Filter out non-python or deleted files.
    py_files_changed = [file
                        for file in [f.strip() for f in sub.stdout.readlines()]
                        if (file.endswith(".py") and os.path.exists(file))
                            or is_py_script(file)]
 
    # Run Pylint on each file, collect the results, and display them for the
    # user.
    results = {}
    for file in py_files_changed:
        pylint = Popen(("pylint -f text %s" % file).split(),
                       stdout=PIPE)
        pylint.wait()
 
        output = pylint.stdout.read()
        print output
            
        results_re = re.compile(r"Your code has been rated at ([\d\.]+)/10")
        results[file] = float(results_re.findall(output)[0])
 
    # Display a summary of the results (if any files were checked).
    if len(results.values()) > 0:
        print "==============================================="
        print "Final Results:"
        for file in results:
            result = results[file]
            grade = "FAIL" if result < PYLINT_PASS_THRESHOLD else "pass"
            print "[ %s ] %s: %.2f/10" % (grade, file, result)
 
    # If any of the files failed the Pylint test, exit nonzero and stop the
    # commit from continuing.
    if any([(result < PYLINT_PASS_THRESHOLD)
            for result in results.values()]):
        print "git: fatal: commit failed, Pylint tests failing."
        sys.exit(1)
    else:
        sys.exit(0)
 
def is_py_script(filename):
    """Returns True if a file is a python executable."""
    if not os.access(filename, os.X_OK):
        return False
    else:
        try:
            first_line = open(filename, "r").next().strip()
            return "#!" in first_line and "python" in first_line
        except StopIteration:
            return False


if __name__ == "__main__":
    main()