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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 get_handler(query_result_type, return_type):
 """ Find the appropriate return type handler to convert the query result to the desired return type :param query_result_type: type, desired return type :param return_type: type, actual return type :return: callable, function that will handle the conversion """

        try:
            return FormatterRegistry.get_by_take_and_return_type(query_result_type, return_type)
        except (IndexError, AttributeError, KeyError):
            raise IndexError(
                'Could not find function in conversion list for input type %s and return type %s' % (
                query_result_type, return_type))