def impl_len_iters(d):
    """len(dict.keys()), len(dict.values()), len(dict.items())
    """
    if not isinstance(d, (DictKeysIterableType,
                      DictValuesIterableType, DictItemsIterableType)):
        return

    def impl(d):
        return _dict_length(d._parent)

    return impl
len(dict.keys()), len(dict.values()), len(dict.items())
    
numba/typed/dictobject.py