docs: def filter_kwargs(keys, kwargs):
      """
      :param keys: A iterable key names to select items
      :param kwargs: A dict or dict-like object reprensents keyword args
  
      >>> list(filter_kwargs(("a", "b"), dict(a=1, b=2, c=3, d=4)))
      [('a', 1), ('b', 2)]
      """
      for k in keys:
          if k in kwargs:
              yield (k, kwargs[k])