manipulation_set.py 文件源码

def parser(cls):
        rename = pp.Suppress("rename")
        rename_kwarg = common_parsers.column + pp.Suppress("=") + common_parsers.column
        rename_kwarg.setParseAction(lambda x: {x[0]: x[1]})

        kwargs = pp.Group(pp.delimitedList(rename_kwarg))
        kwargs.setParseAction(lambda x: {k: v for d in x for k, v in d.items()})

        parser = rename + pp.Suppress("(") + kwargs + pp.Suppress(")")
        parser.setParseAction(lambda x: Rename(columns=x[0]))
        return parser