code: def fromkeys(cls, iterable, value=None):
          # TODO : type: (Iterable, Union[Any, Callable]) -> DictWrapper
          # https://github.com/python/mypy/issues/2254
          
          if not callable(value):
              return cls(dict.fromkeys(iterable, value))
  
          return cls((key, value(key)) for key in iterable)
docs: Create a new d from
  
          Args:
              iterable: Iterable containing keys
              value: value to associate with each key.
              If callable, will be value[key]
  
          Returns: new DictWrapper
  
          Example:
  
              >>> from ww import d
              >>> sorted(d.fromkeys('123', value=4).items())
              [('1', 4), ('2', 4), ('3', 4)]
              >>> sorted(d.fromkeys(range(3), value=lambda e:e**2).items())
              [(0, 0), (1, 1), (2, 4)]