recipe-576550.py 文件源码

def grouper(n, iterable, fillvalue=None):
    # http://docs.python.org/dev/3.0/library/itertools.html#module-itertools
    "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
    args = [iter(iterable)] * n
    return itertools.zip_longest(fillvalue=fillvalue, *args)