spencer wrote:
> first Q.. Why is pop() starting from the back
> back of the stack?
Because that is what it does. Try reading the documentation:
>>> help(list.pop)
Help on method_descriptor:
pop(...)
L.pop([index]) -> item -- remove and return item at index (default
last)
> second Q.. Why can't I never empty the stack?
Because you are modifying a list while iterating over it which is never a
good idea. What you have now pops items from the end of the loop so it
stops about half way along. If you change it to pop item 0 then it will
shift the items down and your iteration will end up skipping over about
half of them.
Try something like this:
def buildStackMajor():
while dirStackMinor:
dirStackMajor.append(dirStackMinor.pop(0))
although in that case you might just as well get rid of the loop entirely:
dirStackMajor += dirStackMinor
del dirStackMinor[:]
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