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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]# how to let argument be optional falling back to certain integer

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On Sun, Jun 21, 2020 at 2:02 AM Boris Dorestand <bdorestand at example.com> wrote: > > I just wrote > > def f(y, N, k = None): > k = k or (N - 1) > return k > > I was surprised to find out that 0 == False, so f(7, 31, 0) produces 31. > > I'd like 0 to be a valid choice for k. > > How do you guys let k be an optional argument such that it defaults to > N - 1? > The easiest way is to explicitly check for None. if k is None: k = N - 1 Zero being false shouldn't be a surprise. If None can count as false, then so should other "emptiness" values. (Remember, the canonical falseness value is False, not None.) ChrisA

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