old_contents: from collections import namedtuple
  
  ServerConf = namedtuple('ServerConf', ['port', 'host'])
  
  Coords = namedtuple('Coords', ['lon', 'lat'])
  
new_contents: from collections import namedtuple
  
  ServerConf = namedtuple('ServerConf', ['port', 'host'])
  
  Coords = namedtuple('Coords', ['lng', 'lat'])
  
subject: Update structs.py