##带索引的遍历

for index, value in enumerate(range(10, 100)):
     print(index, value)

##好用的zip方法

for x, y in zip(range(1, 10), range(10, 20)):
    print(x, y)

##循环中的的else子句

from math import sqrt
for item in range(99, 1, -1):
    print(item)
    root = sqrt(item)
    print(root)
    if(root == int(root)):
        print(item)
        break
else:
    print("没有执行break语句。")

##闭包

def func(x):
    def inner_func(y):
        print(x+y)
    return inner_func
f = func(10)
f(1)
f(2)