__init__.py 文件源码

def process_parentheses(token, previous_token):
    if token.string == '(':
        is_function = (
            previous_token and
            (
                (previous_token.string in CLOSE_ATOM_STRINGS) or
                (
                    previous_token.type == mod_token.NAME and
                    previous_token.string not in ALL_KWDS
                )
            )
        )
        if is_function:
            tk_string = previous_token.string
            if tk_string in NOT_PYTHON_2_KWDS:
                return [PY2_ONLY_ERROR]
            if tk_string in NOT_PYTHON_3_KWDS:
                return [PY3K_ONLY_ERROR]
        else:
            return [TUPLE_OR_PARENTH_FORM]

    return [True]