Python题目练习

Posted 2020-10-11

1、使用while循环输入 1 2 3 4 5 6  8 9 10

i = 1
while i <=10 :
    if i != 7:
        print(i)
    else:
        print(‘ ‘)
    i += 1

 

2、求1-100的所有数的和

i = 1
sum = 0
while i <= 100:
    sum += i
    i += 1
print(sum)

 

3、输出 1-100 内的所有奇数

i = 1
while i <= 100:
    print(i)
    i += 2

 

4、输出 1-100 内的所有偶数

i = 2
while i <= 100:
    print(i)
    i += 2

 

5、求1-2+3-4+5 ... 99的所有数的和

i = 1
sum = 0
while i < 100:
    if i%2 == 1:
        sum += i
    else:
        sum -= i
    i += 1
print(sum)

 

6、用户登陆（三次机会重试）

i = 1
while i <= 3:
    name = input(‘请输入用户名：‘)
    password = input(‘请输入密码：‘)
    if name == ‘悟空‘ and password == ‘123‘:
        print(‘登陆成功‘)
        break
    else:
        print(‘登陆失败‘)
    i += 1