Error in loops, new to Python

[nilamo]

I think the easy solution is to just iterate over a copy of the list, ie: for x in some_list[:]:, but then if the list is large (or is a generator and doesn't exist fully yet), that could just eat memory. Maybe for x in (item for item in some_list):? That way you can modify the original list, without changing how you iterate. Could make for confusing results sometimes, though.