code: def make_dir(dir_name, linux_mode=0o755, error_if_not_writable=False):
      
      if not os.path.exists(dir_name):
          os.makedirs(dir_name, linux_mode)
      elif error_if_not_writable:
          if not os.access(dir_name, os.R_OK | os.W_OK | os.X_OK):
              raise IOError('Directory {0} is not writable.'.format(dir_name))
docs: Creates a directory, if it doesn't exist already. If the directory does exist, and <error_if_not_writable> is True,
      the directory will be checked for writability.
      :param str|unicode dir_name: The name of the directory to create
      :param int linux_mode: The mode/permissions to set for the new directory expressed as an octal integer (ex. 0o755)
      :param bool error_if_not_writable: The name of the file to read