枚举

names = ['aa', 'bb', 'cc', 'dd']
for name in enumerate(names):
    print(name)

# (0, 'aa')
# (1, 'bb')
# (2, 'cc')
# (3, 'dd')
print("")

for index,name in enumerate(names):
    print(index+1,name)

# 1 aa
# 2 bb
# 3 cc
# 4 dd
print("")

product = [('iphone',8000),('mac book',12000),('book',80),('pen',40),('bike',600)]

for  name in product:
    print(name)

print("")

for index,name in product:
    print(index,name)

print("")

for index,name in enumerate(product):#index名字任意写，用于输出索引值
    print(index,name)