Python-S13作业-day1-之登陆程序

                          Python-S13-day1                                

需求：

1.让用户输入账号密码，账号密码正确，登陆程序，打印欢迎信息；

2.如果账号，或密码输入错误，提示用户重新输入，用户有三次机会；

3.如果用户第三次输入的账号或者密码还是不正确，就把第三次输入的账号锁定。

主程序：

#!/usr/bin/python env
#_*_coding:utf-8 _*_
userfile1='userfile'
lockfile1='lockfile'
userfile=open(userfile1,'r+')
lockfile=open(lockfile1,'r+')

login_flag = False
#设置一个标志位，用于判断用户是否登陆成功；
for i in range(3):
    username=input("username:")
    for lockuser in lockfile.readlines():
        lockuser = lockuser.split()
        #把被锁定的账号，转换成一个列表；
        if username in lockuser:
        #判断账号是否在锁定列表中，如果在，就退出；
            exit("%s user is lock"%username)
    password = input("password:")
    for line in userfile.readlines():
        line = line.split()
        #把允许登陆的用户名，密码转换成列表；
        user = line[0]
        #把登陆账号赋值给user
        passwd = line[1]
        #把登陆密码赋值给passwd
        if user == username and passwd == password:
        #判断账号，密码是否正确，如果正确，登陆并打印欢迎信息；
            exit("welcomto login.")
            login_flag = True
            #标志位，判断用户是否登陆成功；
    if login_flag == False:
        print("user or passwd error.")
else:
    print("%s user is lock."%username)
    lockfile.write("	%s"%username)
    lockfile.close()
    #循环三次后，用户还没有登陆成功，就把账号锁定；

Readme：

1.这个程序一共三个文件：userfile存放登陆账号，密码的文件；

　　　　　　　　　　　　lockfile存放被锁定的账号；

　　　　　　　　　　　　login.py登陆主程序；

流程图：

思路二（功能全部实现）：

#!/usr/bin/python env
#_*_coding:utf-8 _*_
user = open('db','r+')
lock = open('db1','r+')
mark = False
for i in range(3):
    username = input("input user name:")
    for line in lock.readlines():
        line = line.split("|")
    if username in line:
        exit("user is lock.")
    passwd = input("input you password.")
    for pwd in user.readlines():
        pwd = pwd.split("|")
        if pwd[0] == username and pwd[1].strip("
") == passwd:
            exit("welcoto login.")
    else:
        print('user or passwd error.')
else:
    print("%s user is lock"%username)
    lockuser = open('db1','a')
    lockuser.write("|"+"%s"%username)
    lockuser.close()


* lockuser.txt
0||1|11

*loginuser.txt
admin|123
freddy|123

 思路三（函数写法）：

#用户输入三次，密码不正确，锁定账号，功能没有实现；

def register(user,pwd):
    reg = open('db','a')
    reg.write("
" + user + "|" + pwd )
    reg.close()

def login (user,pwd):
    lockuser = open('db1','r')
    for line in lockuser.readlines():
        line = line.split("|")
        if user in line:
            exit("user is lock.")
    userpwd = open('db','r')
    for logpwd in userpwd:
        logpwd = logpwd.split("|")
        if user == logpwd[0] and pwd == logpwd[1].strip("
"):
            exit("welcome to login")
    else:
        print("user or password error")
    input_num = input("input y or n.")
    if input_num == 'y':
        main()
    else:
        exit()


def main():
    choice = input("1.register.  2.login.")
    if choice == '1':
        username = input("username:")
        password = input("password:")
        register(username,password)
    elif choice == '2':
        username = input("username:")
        password = input("password:")
        login(username,password)
main()