Raymond Hettinger <[EMAIL PROTECTED]> writes:
> > I presume you did scans of
> > large code bases and you did not find occurrences of
> > takewhile and dropwhile, right?
>
> Yes.
I think I have used them. I don't remember exactly how. Probably
something that could have been done more generally with groupby.
I remember a clpy thread about a takewhile gotcha, that it consumes an
extra element:
>>> from itertools import takewhile as tw
>>> x = range(10)
>>> z = iter(x)
>>> list(tw(lambda i:i<5, z))
[0, 1, 2, 3, 4]
>>> z.next()
6
I.e. I had wanted to use takewhile to split a list into the
initial sublist satisfying some condition, and the rest of the
list.
This all by itself is something to at least warn about. I don't
know if it's enough for deprecation.
I've been cooking up a scheme for iterators with lookahead, that I
want to get around to coding and posting. It's a harder thing
to get right than it at first appears.
--
http://mail.python.org/mailman/listinfo/python-list
