An elegant and fast way to consecutively iterate over two or more containers in Python?

Question

I have three collection.deques and what I need to do is to iterate over each of them and perform the same action:

for obj in deque1:  
    some_action(obj)           


        

Answer 1

I would simply do this :

for obj in deque1 + deque2 + deque3:  
some_action(obj)