python-pickle模块使用实例

以下代码主要实现的是用户登录，注册，密码验证，账户锁定，重置和修改密码等功能

import pickle
#第一次运行请去掉下面一段代码的注释
'''
users_db = open("users.txt","wb")
users_list = [["admin","admin",1],["tiannan","123456",1],["jide","123",0]]
#["admin","admin",1] -> [<用户名>,<密码>,<锁(是/否)>]
pickle.dump(users_list,users_db)
users_db.close()
'''

users_db=open("users.txt","rb")
users_list=pickle.load(users_db)
users_db.close()
#print(users_list)

#用户登录机会
users_pass = {}
for i in users_list:
    users_name = i[0]
    users_pass[users_name]=3
#users_pass = {"admin":3,"tiannan":3,"jide":3} -> {<用户名>:<可尝试登录次数>}
#print(users_pass)

def ha_user(user_name):
    no_user = "yes"
    for j, users_msg in enumerate(users_list):
        #print(i,users_msg)
        #判断用户名是否存在
        if user_name in users_msg:
            no_user = j
            break
    return no_user

def write_db():
    users_db = open("users.txt","wb")
    pickle.dump(users_list,users_db)
    users_db.close()

def change_password():
    password1 = input("请输入新密码：")
    password2 = input("请再次输入新密码：")
    if password1 == password2:
        users_list[index][1] = password1
        write_db()
        print("密码修改成功！")
    else:
        print("您输入的密码不一致！")

while True:
    sel = int(input("选择：<1>登录 <2>注册\n"))
    if sel == 1:
        name = input("请输入用户名:")
        password = input("请输入密码:")

        index = ha_user(name)
        if index == "yes":
            print("用户名不存在!")
        else:
            users_info = users_list[index]
            #判断用户是否处于锁定状态
            if users_info[-1] == 0:
                print("%s用户已被锁，请联系管理员解锁账户!" % users_info[0])
            else:
                if password == users_info[1]:
                    #重置账户锁定验证次数
                    users_pass[name]=3
                    print("登录成功!")
                    while name == "admin":
                        sel2 = int(input("请选择：<1>修改密码 <2>重置用户 <3>查看用户 <4>退出\n"))
                        if sel2 == 1:
                            change_password()
                        elif sel2 == 2:
                            name2 = input("请输入需要重置的用户名：")
                            index3 = ha_user(name2)
                            if index3 == "yes":
                                print("用户名不存在!")
                            else:
                                users_list[index3][1]= ""
                                users_list[index3][-1]= 1
                                write_db()
                                print("%s用户重置成功！" % name2)
                        elif sel2 == 3:
                            name2 = input("请输入查找的用户名：")
                            index2 = ha_user(name2)
                            if index2 != "yes":
                                print(users_list[index2])
                            else:
                                print("该用户不存在！")
                        elif sel2 == 4:
                            break
                    while name != "admin":
                        sel3 = int(input("请选择：<1>修改密码 <2>退出\n"))
                        if sel3 == 1:
                            change_password()
                        elif sel3 == 2:
                            break
                else:
                    users_pass[name]-=1
                    if users_pass[name] > 0:
                        print("密码错误,你还有%d次机会，请重新登录!" % users_pass[name])
                    else:
                        users_list[index][-1]=0
                        write_db()
                        print("%s用户多次登录失败，已被锁，请联系管理员解锁账户!" % users_info[0])
    elif sel == 2:
        name = input("请输入用户名:")
        password = input("请输入密码:")

        result = ha_user(name)
        if result == "yes":
            user_list = [name,password,1]
            users_list.append(user_list)
            write_db()
            print("注册成功！")
        else:
            print("该用户名已被注册！")

此代码仅供参考，欢迎各位博友的留言！