> How about an until keyword in generator expressions:
New keywords are not on the table for generator expressions. You
could do this with 'while' (which is just 'until not' -- note that
your example uses that :-) but I'd be against making this part of the
syntax more complex. You can do that with itertools.takewhile or
dropwhile anyway.
> And we could have accumulators first() and last():
>
> def first(it):
> return it.next()
This begs for using a plain old loop statement with a 'break'.
> def last(it):
> for value in it:
> pass
> return value
What if it is empty?
> first(line for line in file if line.startswith("#"))
>
> if not last(file):
> # last line not terminated
The comment is incorrect.
--Guido van Rossum (home page: http://www.python.org/~guido/)
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