docs: def port(port_number, return_format=None):
      """Summary information about a particular port.
  
      In the returned data:
  
      Records: Total number of records for a given date.
      Targets: Number of unique destination IP addresses.
      Sources: Number of unique originating IPs.
  
      :param port_number: a string or integer port number
      """
      response = _get('port/{number}'.format(number=port_number), return_format)
      if 'bad port number' in str(response):
          raise Error('Bad port number, {number}'.format(number=port_number))
      else:
          return response