Generator using item[n-1] + item[n] memory
Nick Timkovich
prometheus235 at gmail.com
Fri Feb 14 22:31:49 EST 2014
OK, now the trick; adding `data = None` inside the generator works, but in
my actual code I wrap my generator inside of `enumerate()`, which seems to
obviate the "fix". Can I get it to play nice or am I forced to count
manually. Is that a feature?
On Fri, Feb 14, 2014 at 9:21 PM, Roy Smith <roy at panix.com> wrote:
> In article <mailman.6952.1392433921.18130.python-list at python.org>,
> Nick Timkovich <prometheus235 at gmail.com> wrote:
>
> > Ah, I think I was equating `yield` too closely with `return` in my head.
> > Whereas `return` results in the destruction of the function's locals,
> > `yield` I should have known keeps them around, a la C's `static`
> functions.
> > Many thanks!
>
> It's not quite like C's static. With C's static, the static variables
> are per-function. In Python, yield creates a context per invocation.
> Thus, I can do
>
> def f():
> for i in range(10000):
> yield i
>
> g1 = f()
> g2 = f()
> print g1.next()
> print g1.next()
> print g1.next()
> print g2.next()
> print g1.next()
>
>
> which prints 0, 1, 2, 0, 3. There's two contexts active at the same
> time, with a distinct instance of "i" in each one.
> --
> https://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20140214/680cf12d/attachment.html>
More information about the Python-list
mailing list