Python要练习的东西

明天要练习和要掌握的东西

username = 'xiaoming'
password = '123'
i = 0
while i < 3:
    name = input('请输入你的用户名：')
    pwd = input('请输入密码：')
    if username == name and password == pwd:
        print('你登录成功！')
        break
    else:
        print('登录失败，你还有%d次登录机会' %(2-i))
        if 2-i == 0:
            result = input('是否还想再试试？Yes')
            if result == 'Yes':
                i = 0
                continue
    i += 1
else:
    print('你没有机会了！')