python基础

Posted 2021-03-05 qingmuzi

1、使用while循环输入1 2 3 4 5 6 ... 8 9 10

count = 1
while count <= 10:
    print(count)
    # count = count + 1
    count += 1

2、使用while循环输入1 2 3 4 5 6  8 9 10

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

3、使用while循环输入1 2 3 4 5 6 8 9 10
方法一、

count = 0
while count < 10:
    count += 1
    if count == 7:
        continue
    print(count)

方法二、

count = 0
while count < 10:
    count += 1
    if count == 7:
        pass
    else:
        print(count)

4、输出1-100内所有的奇数
方法一、

count = 0
while count < 100:
    count += 1
    if count % 2 == 1:
        print(count)

方法二、

count = 1
while count < 99:
    count += 2
    print(count)

5、求1-2+3-4+5...+99的所有数的和

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

6、用户登录（三次机会重试）

count = 0
while count < 3:
    name = input("请输入用户名")
    password = input("请输入密码")
    if name == ‘mahelin‘ and password == ‘250238linlin‘:
        print("登录成功")
    elif count == 2:
        print("登录失败")
    else:
        print("登录失败请重试")
    count += 1