code: def get_mainmarket_ip(ip, port):
      
  
      global best_ip
      if ip is None and port is None and best_ip['stock']['ip'] is None and best_ip['stock']['port'] is None:
          best_ip = select_best_ip()
          ip = best_ip['stock']['ip']
          port = best_ip['stock']['port']
      elif ip is None and port is None and best_ip['stock']['ip'] is not None and best_ip['stock']['port'] is not None:
          ip = best_ip['stock']['ip']
          port = best_ip['stock']['port']
      else:
          pass
      return ip, port
docs: [summary]
  
      Arguments:
          ip {[type]} -- [description]
          port {[type]} -- [description]
  
      Returns:
          [type] -- [description]