Precommit python files testing and running PEP8 control after commit into git

precommit

#!/usr/bin/env python

import os
import re
import subprocess
import sys

modified_re = re.compile('^[AM]+\s+(?P<name>.*\.py)', re.MULTILINE) 


def get_staged_files():
    """Get all files staged for the current commit.
    """
    git = subprocess.Popen(['git', 'status', '--porcelain'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out,error = git.communicate()

    staged_files = modified_re.findall(out)
    return staged_files


def get_test_apps():
    """Return apps with tests folder
    """
    tests = []
    for root, subFolders, files in os.walk('.'):
        if 'tests' in subFolders:
            val = root.split('/')
            # Exclude apps to test
            if val[-1] != '<app_name_to_exclude>':
                tests.append(val[-1])
    return tests


def main():
    abort = False
    # Getting stage files
    staged_files = get_staged_files()
    # Staging changed files
    subprocess.call(['git', 'stash', '-u', '-q', '--keep-index'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    # staged_files is empty, nothing to do
    if len(staged_files) == 0:
        print 'No python files to evaluate' 
        sys.exit(0)

    print '========== Checking PEP8 =========='
    for filename in staged_files:
        proc = subprocess.Popen(['pep8', '--max-line-length=119', '--show-source', filename], stdout=subprocess.PIPE)
        output, _ = proc.communicate()
        # If pep8 still reports problems then abort this commit.
        if output:
            abort = True
            print '========= Found PEP8 ERROR =========='
            print output
        else:
            print 'PEP8 correct'

    # Run unit test
    cwd = os.getcwd() + '/<project_folder>/'

    print '========== Running unit tests =========='
    data = ['python', 'manage.py', 'test', '--noinput', '--settings=settings.test'] + get_test_apps()
    proc = subprocess.Popen(data, stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=cwd)
    out, error = proc.communicate()
    
    if 'FAILED' in error:
        print 'There are errors in unit tests: {0}'.format(error)
        abort = True
    else:
        print 'tests PASSED'
    print '========== =========='

    # Un-staging previously files
    subprocess.call(['git', 'stash', 'pop', '-q'], stdout=subprocess.PIPE)

    # Final result
    if abort:
        print '========== ABORTING commit =========='
        sys.exit(1)
    else:
        sys.exit(0)

if __name__ == '__main__':
    main()