I have a couple of lists which vary in length, and I would like to compare each of their items with an integer, and if any one of the items is above said integer, it breaks
Using the builtin any is the clearest way. Alternatively you can nest a for loop and break out of it (one of the few uses of for-else construct).
any
for lst in listoflists: for i in lst: if i > 70: break else: # rest of your code pass