Ulrich Eckhardt, 03.09.2010 08:52:
Tim Wintle wrote:
[..] under the hood, cpython does something like this (in psudo-code)
itterator = xrange(imax)
while 1:
next_attribute = itterator.next
try:
i = next_attribute()
except:
break
a = a + 10
There is one thing that strikes me here: The code claims that each iteration
there is a lookup of the 'next' field in the iterator. I would expect that
this is looked up once before the loop only.
Can you confirm that or am I misinterpreting your intention here?
It needs to do that. Nothing keeps you from redefining "next" in each call.
That's even a well known way to implement state machines.
However, as usual, the details are a bit different in CPython, which has a
C level slot for the "next" method. So the lookup isn't as heavy as it looks.
Stefan
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