code: def add_trunk_group(self, intf, value):
          
          string = 'switchport trunk group {}'.format(value)
          return self.configure_interface(intf, string)
docs: Adds the specified trunk group to the interface
  
          Args:
              intf (str): The interface name to apply the trunk group to
              value (str): The trunk group value to apply to the interface
  
          Returns:
              True if the operation as successfully applied otherwise false