On 15/02/2014 03:31, Nick Timkovich wrote:
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 <r...@panix.com
<mailto:r...@panix.com>> wrote:
In article <mailman.6952.1392433921.18130.python-l...@python.org
<mailto:mailman.6952.1392433921.18130.python-l...@python.org>>,
Nick Timkovich <prometheus...@gmail.com
<mailto:prometheus...@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.
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