code: def make_converters(data_types) -> dict:
      
  
      return {k: TYPE_CASTERS.get(v, v) for k, v in data_types.items()}
docs: Return a mapping between data type names, and casting functions,
      or class definitions to convert text into its Python object.
      Parameters
      ----------
      data_types: dict-like
          data field name str: python primitive type or class.
      Example
      -------
      >> make_converters({'student': str, 'score': float, 'grade': Grade) ->
      {'student_name': passthrough, 'score': parse_float, 'grade': Grade)