Python实现注册和三次验证登录

Posted 2021-01-16 searchforyou

# 帐户表account：
# sylar:123
# alex:456
# wusir:789
# taibai:789
# 需熟练的知识点：文件操作with open()/write()/read()、去掉所有空格strip()、切割split()、所有字母大写upper()
# 循环for...in...、判断if...else... 

def regist():
    # 输入数据
    # 用户名若存在则不通过：注册失败
    # 通过则存入account: mode="r+"
    print("请输入用户名及密码完成注册")
    username = input("请输入注册用户名：")
    password = input("请输入密码")
    with open("account", mode="r+", encoding="utf-8") as f:
        for line in f:            # sylar:123
            if username == line.strip().split(":")[0]:
                print("对不起，该用户已注册")
                break
        else:
            f.write("
"+username+":"+password)
            print("注册名为：%s" % username)
            print("注册的密码为：%s" % password)
regist()

def login():
    count = 3
    while count > 0:
          count -= 1
          username = input("请输入用户名：").strip()
          password = input("请输入密码：").strip()
          with open("account", mode="r", encoding="utf-8") as f:  
               for item in f:
                   if username +":"+password == item.strip():
                       return True
               else:
                    print("密码错误，您还有%s 次机会" % count)
    return "程序退出"
while 1:
    print("注册: 1 登录: 2 退出: Q")
    num = input("请输入:").strip()
    if num.upper() == "Q":
        break
    elif num == "1":
        regist()
    elif num == "2":
        if login():
            print("登录成功!")
            break
        else:
            print("登录失败!")
    else:
        print("输入错误! 重新输入!")