code: def modified(self):
          '''
          Get human-readable last modification date-time.
  
          :returns: iso9008-like date-time string (without timezone)
          :rtype: str
          '''
          try:
              dt = datetime.datetime.fromtimestamp(self.stats.st_mtime)
              return dt.strftime('%Y.%m.%d %H:%M:%S')
          except OSError:
              return Nonf modified(self):
          '''
          Get human-readable last modification date-time.
  
          :returns: iso9008-like date-time string (without timezone)
          :rtype: str
          '''
          try:
              dt = datetime.datetime.fromtimestamp(self.stats.st_mtime)
              return dt.strftime('%Y.%m.%d %H:%M:%S')
          except OSError:
              return None
docs: Get human-readable last modification date-time.
  
          :returns: iso9008-like date-time string (without timezone)
          :rtype: str