小编Big*_*igZ的帖子

我需要模拟izip_longest从itertools在Python 2.4

import itertools
class Tools:
    @staticmethod
    def izip_longest(*args, **kwds):
        # izip_longest('ABCD', 'xy', fillvalue='-') --> Ax By C- D-
        fillvalue = kwds.get('fillvalue')
        counter = [len(args) - 1]
        def sentinel():
            if not counter[0]:
                raise ZipExhausted
            counter[0] -= 1
            yield fillvalue
        fillers = itertools.repeat(fillvalue)
        iterators = [itertools.chain(it, sentinel(), fillers) for it in args]
        try:
        while iterators:
            yield tuple(map(next, iterators))
        except ZipExhausted:
            pass       


class ZipExhausted(Exception):
    pass

一切正常,直到我到达yield tuple(map(next, iterators)); Python 2.4抛出一个

NameError: global name 'next' is not …