numbers = [1, 2, 3, 4] for number in numbers: # do something # nested for i in range(10): for j in range(10): # do something # iterating dictionaries dict = {'Alpha': 1, 'Beta': 2} for key in dict.keys(): print (key) # Alpha Beta for value in dict.values(): print (value) # 1 2 for key, value in dict.items(): print (key, value) # ('Alpha', 1) ('Beta', 2)