code: def _servicegroup_get_server(sg_name, s_name, s_port=None, **connection_args):
      '''
      Returns a member of a service group or None
      '''
      ret = None
      servers = _servicegroup_get_servers(sg_name, **connection_args)
      if servers is None:
          return None
      for server in servers:
          if server.get_servername() == s_name:
              if s_port is not None and s_port != server.get_port():
                  ret = None
              ret = server
      return ref _servicegroup_get_server(sg_name, s_name, s_port=None, **connection_args):
      '''
      Returns a member of a service group or None
      '''
      ret = None
      servers = _servicegroup_get_servers(sg_name, **connection_args)
      if servers is None:
          return None
      for server in servers:
          if server.get_servername() == s_name:
              if s_port is not None and s_port != server.get_port():
                  ret = None
              ret = server
      return ret
docs: Returns a member of a service group or None