需求:用户的登录验证,登录错误三次锁定用户,用户名和密码保存在文件中
编译环境:python3
流程图如下:
代码如下:
file = open('lock.txt').readlines() name = input("username: >>").strip() lock = [] for i in file: line = i.strip(' ') lock.append(line) if name in lock: print(name, "已经被锁定") else: i = 1 while i <= 3: i += 1 print('...........') username = name print(username) password = input('password: >>').strip() f = open('user.txt', encoding='utf-8').readlines() login = False if len(username) != 0 and len(password) != 0: # 判断是否为合法输入 for line in f: if username == line.split()[0] and password == line.split()[1]: # 用户名和密码匹配正确 print('欢迎登录') login = True break else: continue if login is False: print(u'帐号或密码错误') if login is True: break else: f = open('lock.txt', 'a') f.write(name) f.write(' ') f.close() print('您的密码输入错误已达三次,帐号锁定,退出')