Arnaud Delobelle schrieb:
ceciliasei...@gmx.de writes:
As you were talking about list.pop()...
Is anyone able to reproduce the following and explain why this happens
by chance? (Using 3.1.1)
l1 = ["ready", "steady", "go"]
l2 = ["one", "two", "tree"]
l3 = ["lift off"]
for w in l1:
Ouch... thanks Arnaud... The stable way would've been
for w in l1[:]: #use copy of l1 for iteration
print(l1.pop()) #decomposite list
(just in case any other newbie is reading this...)
print(l1.pop()) #prints only "go steady" - why not "ready"??
I suggest you simulate the loop above using pen and paper, writing the
value of w and the value of l1 at each iteration. The behaviour you are
observing should then be clearly explained. And you should also realise
that it's a really bad idea to mutate a list that you are iterating on!
HTH
--
http://mail.python.org/mailman/listinfo/python-list
