Kris Schnee wrote:
Dave LeCompte wrote:
I did notice that you were using "y" as both a coordinate and as a flag
for whether the current pixel is yellow. Do you still have trouble if
you
don't reuse "y" in this way?
Oops. I tried calling it "yellow" instead, and it suddenly works. I
don't understand _why_ it works though, and this bothers me. Re-using
variable names like that is bad, of course, but in this case the first
version of "y" is being used to get the color of the test image at a
certain pixel, and then "y" is used to represent whether that pixel is
yellow. Since the color is already gotten by the time "y" is changed,
using "y" for "yellow" should have no effect -- and I don't see why it
would lead to the "sticky variable."
The loop says "for y in range(something)." I thought that loops used
each value in the list produced by the range statement, so that Python
would be unaffected if I changed y during the loop.
"for y in range(self.size)" is the outer loop. So y is an index for the
first pass of the inner x loop. Then its value is clobbered, replaced
with some color test. So the next pass through the x loop it is no
longer an index.
--
Lenard Lindstrom
<[EMAIL PROTECTED]>
