docs: def zip(self, xs: 'List[B]') -> 'List[Tuple[T, B]]':
          """doufo.List.zip: zip with another `List` object ot `tuple List` object
          Args:  
              `self`:  
              `xs` (`List[B]`): anther `List` object
          Returns:  
              return (`type`):description  
          Raises:  
              If the length of input and current object differs, warning!
          """
          if len(self) == len(xs):
              return List([(x, y) for x, y in zip(self, xs)])
          else:
              print(f"Warning: The two inputs have different lengths: {len(self)} and {len(xs)}")
              return List([(x, y) for x, y in zip(self, xs)])