Bengt Richter wrote:
> >>> def pcniter(seq, NULL=NotImplemented):
> ... seqiter = iter(seq)
> ... prev = curr = NULL
> ... try: next = seqiter.next()
> ... except StopIteration: return
> ... for item in seqiter:
> ... prev, curr, next = curr, next, item
> ... yield prev, curr, next
> ... yield curr, next, NULL
> ...
Just a reminder:
"""
In a generator function, the return statement is not allowed to include
an expression_list[3]. In that context, a bare return indicates that the
generator is done and will cause StopIteration to be raised.
"""
try:
# may raise StopIteration
except StopIteration:
return
is the same as
try:
# may raise StopIteration
except StopIteration:
raise StopIteration
and may be simplified to
# may raise StopIteration
Peter
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