枚举遍历

# 枚举遍历:能够同时将下标及对应的元素遍历出来
# 第一个参数为下标,第二个参数为元素
#string
for i in enumerate("abc"):
print(i)
for index, ele in enumerate("abc"):
print(ele)
# list
for index, ele in enumerate([1,2,3]):
print(ele, index)
# tuple
for index, ele in enumerate((100,200,300)):
print(ele, index)
# dict : index:下标 ele:key
for index, ele in enumerate({"a":100, "b":200}):
print(ele)

# set
for index, ele in enumerate(set((1,2,3,4))):
print(index, ele)