python 基础应用1

1、使用while循环输入1 2 3 4 5 6 8 9 10

n = 0
while n < 11:
    n = n + 1
    if n == 7:
        continue
    print(n)

n = 0
while n < 11:
    n = n + 1
    if n == 7:
         pass
     else:
         print(n)

2、输出1-100内的所有奇数

count = 1
while count < 101:
    if count % 2 == 1:
        print(count)
    count += 1

3、求1-100的所有数的和

n = 1
count = 0
while n < 101:
    count += n
    n += 1
print(count)

四、求1-2+3-4+5...+99

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

五、用户登录（三次机会重试）

i = 0
while i < 3 :
    username = input("请输入账号:")
    password = int( input("请输入密码:"))
    if username == "咸鱼哥" and password == 123:
        print('登录成功')
    else:
        print('登录失败请重新登录')
    i += 1

i = 0
while i < 3:
    username = input("请输入账号:")
    password = input("请输入密码:")
    if username == "wws" and password == '':
        print('登录成功')
        break
    else:
        print('登录失败,您还有 %s 次机会，请重新登录' %(2-i))

    i += 1

用户登录