Fate of itertools.dropwhile() and itertools.takewhile()

winjer at gmail.com winjer at gmail.com
Thu Jan 3 17:39:36 CET 2008


On Dec 29 2007, 11:10 pm, Raymond Hettinger <pyt... at rcn.com> wrote:
> I'm considering deprecating these two functions and would like some
> feedback from the community or from people who have a background in
> functional programming.

Well I have just this minute used dropwhile in anger, to find the next
suitable filename when writing database dumps using date.count names:

    filename = "%02d-%02d-%d" % (now.day, now.month, now.year)
    if os.path.exists(filename):
        candidates = ("%s.%d" % (filename, x) for x in count(1))
        filename = dropwhile(os.path.exists, candidates).next()

Much clearer than the alternatives I think, please keep dropwhile and
takewhile in itertools ;)

Cheers,

Doug.



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