code: def order_dict_by(dict_, key_order):
      r
      dict_keys = set(dict_.keys())
      other_keys = dict_keys - set(key_order)
      key_order = it.chain(key_order, other_keys)
      sorted_dict = OrderedDict(
          (key, dict_[key]) for key in key_order if key in dict_keys
      )
      return sorted_dict