On Sun, Jun 21, 2020 at 2:02 AM Boris Dorestand <bdorest...@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 -- https://mail.python.org/mailman/listinfo/python-list
