code: def get_nested_val(key_tuple, dict_obj):
      
      if len(key_tuple) == 1:
          return dict_obj[key_tuple[0]]
      return get_nested_val(key_tuple[1:], dict_obj[key_tuple[0]])
docs: Return a value from nested dicts by the order of the given keys tuple.
  
      Parameters
      ----------
      key_tuple : tuple
          The keys to use for extraction, in order.
      dict_obj : dict
          The outer-most dict to extract from.
  
      Returns
      -------
      value : object
          The extracted value, if exists. Otherwise, raises KeyError.
  
      Example
      -------
      >>> dict_obj = {'a': {'b': 7}}
      >>> get_nested_val(('a', 'b'), dict_obj)
      7