List as FIFO in for loop

[malkarouri]

Hi everyone,

I have an algorithm in which I need to use a loop over a queue on
which I push values within the loop, sort of:

while not(q.empty()):
    x = q.get()
    #process x to get zero or more y's
    #for each y:
    q.put(y)

The easiest thing I can do is use a list as a queue and a normal for
loop:

q = [a, b, c]

for x in q:
    #process x to get zero or more y's
    q.append(y)

It makes me feel kind of uncomfortable, though it seems to work. The
question is: is it guaranteed to work, or does Python expect that you
wouldn't change the list in the loop?

Regards,

Muhammad Alkarouri