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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def create_missing_types(cls, schema, type_dict, type_builder=None):
 """Creates missing types for fields with a CardinalityField part. It is assumed that the primary type converter for cardinality=1 is registered in the type dictionary. :param schema: Parse schema (or format) for parser (as string). :param type_dict: Type dictionary with type converters. :param type_builder: Type builder to use for missing types. :return: Type dictionary with missing types. Empty, if none. :raises: MissingTypeError, if a primary type converter with cardinality=1 is missing. """

        if not type_builder:
            type_builder = cls.type_builder

        missing = cls.extract_missing_special_type_names(schema, type_dict)
        return type_builder.create_type_variants(missing, type_dict)