TitanSnow <tttnns1...@gmail.com> added the comment:
Now I have thought about it and realized that
it's not suitable for islice.
But there's still a common use case to
drop some elements from the beginning or
ending of a iterable, which is also a main
reason why I wanted islice to support
negative values of start and stop.
So how about adding two functions
``drop_first`` and ``drop_last``
to do such things. They can be implemented
like this, in which way they support
arbitrary iterators::
def drop_first(iterable, n=1):
for _ in range(n):
next(iterable)
for e in iterable:
yield e
def drop_last(iterable, n=1):
dq = deque()
for _ in range(n):
dq.append(next(iterable))
for e in iterable:
dq.append(e)
yield dq.popleft()
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33040>
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