def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def test_parse_statements():
    parsed_statement = mariofile.parse_statements(STRING_PARSE_STATEMENTS.splitlines())
    assert '\n'.join(parsed_statement) == "statement\nstatement con commento"