How can I, in python, iterate over multiple 2d lists at once, cleanly?

Question

If I\'m making a simple grid based game, for example, I might have a few 2d lists. One might be for terrain, another might be for objects, etc. Unfortunately, when I need to ite

Answer 1

I'd start by writing a generator method:

def grid_objects(alist, blist):
    for i in range(len(alist)):
        for j in range(len(alist[i])):
            yield(alist[i][j], blist[i][j])

Then whenever you need to iterate over the lists your code looks like this:

for (a, b) in grid_objects(alist, blist):
    if a.is_whatever():
        b.do_something()