1.死循环

while 1 == 1:     print('ok')

结果是一直循环

 

 

2.循环

count  = 0while count < 10:     print(count)     count = count +1print(error)

 

3.练习题 

~ 使用while循环输出1 2 3 4 5 6   8 9 10

count = 1while count <= 10 :                    # 或者count < 11    if count == 7:        print( )                       # 也可以添加pass，什么也不执行    else:       print(count)    count = count + 1

执行结果：

1234568910Process finished with exit code 0

~ 求1-100的所有数的和

a = 1b = 0while a < 101:    b = b + a    a = a + 1print(b)

输出结果：

5050Process finished with exit code 0

 

~求1-100内所有的奇数

n = 1while n < 101:    js = n % 2    if js == 0:        print( )    else:        print(n)    n = n + 1

输出结果：

13579111315171921232527293133353739414345474951535557596163656769717375777981838587899193959799

~ 求1-100内所有的偶数

a = 1while a < 101:    b = a % 2    if b == 0:        print(a)    else:        pass    a = a + 1

输出结果：

2468101214161820222426283032343638404244464850525456586062646668707274767880828486889092949698100Process finished with exit code 0