code: def make_executable(path_str):
    ''' Performs the equivalent of `chmod +x` on the file at path_str.
    :returns: path_str if success, else None
    '''
    try:
      mode = os.stat(path_str).st_mode
      os.chmod(path_str, mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
    except Exception as e:
      print 'Exception: %s' % e
      return None
    return path_stf make_executable(path_str):
    ''' Performs the equivalent of `chmod +x` on the file at path_str.
    :returns: path_str if success, else None
    '''
    try:
      mode = os.stat(path_str).st_mode
      os.chmod(path_str, mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
    except Exception as e:
      print 'Exception: %s' % e
      return None
    return path_str
docs: Performs the equivalent of `chmod +x` on the file at path_str.
    :returns: path_str if success, else None