Python学习第一天代码笔记

#输出1、2、3、4、5、6、8、9、10
num = 1;
while num <= 10:
    print(num);
    num+=1;
    if num==7:num+=1;

# 1到100的和
num = 0;
sum = 1;
while sum<=100:
    num = sum + num;
    sum= sum + 1;

print(num);

#所有奇数
num = 1;
while num <= 100:
    if num%2 == 0:print(num-1)
    num+=1

#所有偶数
num = 1;
while num<=100:
    if num%2 == 0 : print(num);
    num+=1;

# 用户输入三次
i = 0
while i < 3:
    username = input("请输入用户名：")
    password = int(input("请输入用户密码:"))
    if username == "Break" and password == 123:
        print("登录成功")
        break
    else:
        if i == 2:
            print("您输入密码错误的次数过多,已被冻结！")
            break
        print("密码错误请重新输入")
    i += 1