python第一篇 条件循环小练习

输出1 2 3 4 5 6 8 9 10

#!/bin/usr/env python
n = 1;
while n<11:
    if n == 7:
        pass
    else:
        print(n)
    n = n+1
print("---end---")

输出1-100内的奇数

#!/bin/usr/env python
n = 1;
while n<101:
    if n % 2 == 0:
        pass
    else:
        print(n)
    n = n+1
print("---end---")

或

#!/bin/usr/env python
n = 1;
while n<101:
    print(n)
    n = n+2
print("---end---")

求1-100的和

#!/bin/usr/env python
n = 1
s = 0
while n<101:
    s += n
    n = n + 1
print(s)
print("---end---")

求1-2+3...-100的值

#!/bin/usr/env python
n = 1
s = 0
while n<101:
    if n%2==0:
        s -= n
    else:
        s += n
    n = n + 1
print(s)
print("---end---")

用户登录三次机会重试

#!/bin/usr/env python
count = 1
while count < 4:
    first = input("输入密码:")
    if first == "root":
        print("输入正确")
        break;
    else:
        count = count + 1
        if count == 4:
            print("输入超过三次")
            break;
print("---end---")