PYDay7-递归、冒泡算法、装饰器

def login(username,password):
    ‘‘‘
    用于用户名密码的验证
    :param username: 用户名
    :param password: 密码
    :return: Ture 用户验证成功False用户验证失败
    ‘‘‘
    f = open("db",‘r‘,encoding="utf-8")
    for line in f:
        line = line.strip() ##即可去掉空格，也可去除换行符，也可加参数去掉指定的字符
        line_list = line.split("$")
        if username == line_list[0]  and password == line_list[1]:
            return True
            break
    f.close()
    return  False


user = input("请输入用户名")
pwd = input("请输入密码")

if login(user,pwd):
    print("登录成功")
else:
    print("登录失败"

#!/usr/bin/env python
# -*- coding:utf-8 -*-
def login(username,password):
    ‘‘‘
    用于用户名密码的验证
    :param username: 用户名
    :param password: 密码
    :return: Ture 用户验证成功False用户验证失败
    ‘‘‘
    f = open("db",‘r‘,encoding="utf-8")
    for line in f:
        line = line.strip() ##即可去掉空格，也可去除换行符，也可加参数去掉指定的字符
        line_list = line.split("$")
        if username == line_list[0]  and password == line_list[1]:
            return True
            break
    f.close()
    return  False

def register(username,password):
    ‘‘‘
    注册用户
    1、打开文件a
    2、用户名&密码
    :param usernmae:用户名
    :param password: 密码
    :return: True创建成功 False 注册失败
    ‘‘‘
    try:
        with open("db","a",encoding="utf-8") as f:
            temp = "\n" + username + "$" + password
            f.write(temp)
            return True
    except:
        return False

def user_exist(username):
    ‘‘‘
    检查用户名是否存在
    :param username:需要检查的用户名
    :return: True 存在  false 不存在
    ‘‘‘
    #一行一行查找
    with open("db",‘r‘,encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            line_list = line.split("$")
            if line_list[0] == username:
                return  True
    return False
def main():
    print("欢迎登录xxx系统")
    while True:
        inp = input("1:登录，2：注册，其他：退出。")
        if inp == "1":
            user = input("请输入用户名")
            pwd = input("请输入密码")
            if login(user,pwd):
                print("登录成功")
            else:
                print("登录失败")
        elif inp == "2":
            user = input("请输入用户名")
            pwd = input("请输入密码")
            is_exsit = user_exist(user)
            if is_exsit:
                print("用户已存在")
            else:
                result = register(user,pwd)
                if result:
                    print("注册成功")
                else:
                    print("注册失败")
        else:
            break
    print("系统退出")
main()

print(li)
for j in range(1,len(li)):
    for i in range(len(li) - j):
        # current = li[i]
        # next_value = li[i+1]
        # print(i,current,next_value)
        if li[i] > li[i+1]:
            temp = li[i]
            li[i] = li[i+1]
            li[i+1] = temp
print(li)