python while语句

python while语句

while 循环的语法如下:
while expression:
　　suite_to_repeat
while 循环的 suite_to_repeat 子句会一直循环执行, 直到 expression 值为布尔假.

1、计数循环

a = 0
while a < 10:
    print a
    a += 1

2、break退出循环

while True:
    a = 0
    print a
    if a = 9:
        break
    a += 1