Armin <feng.sh...@gmail.com> wrote:
> Could you give an example of next() with a sentinel and describe its
> use case please? I have a little trouble understanding what you guys
> mean!
It means you don't have to worry about next() throwing StopIteration.
e.g.
>>> def pairs(sequence, padding=None):
sequence = iter(sequence)
for a in sequence:
b = next(sequence, padding)
yield a, b
>>> list(pairs('abcd'))
[('a', 'b'), ('c', 'd')]
>>> list(pairs('abcde'))
[('a', 'b'), ('c', 'd'), ('e', None)]
--
Duncan Booth http://kupuguy.blogspot.com
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