Enumerate List
animals = ['cat', 'dog', 'monkey']
for idx, animal in enumerate(animals):
print ('#%d: %s' % (idx , animal))
#0: cat
#1: dog
#2: monkey
animals = ['cat', 'dog', 'monkey']
for idx, animal in enumerate(animals):
print ('#%d: %s' % (idx , animal))
#0: cat
#1: dog
#2: monkey