详解Python用户登录接口的方法

# Author: Steven Zeng'''作业2：编写登录接口输入用户名密码认证成功后显示欢迎信息输错3次后锁定'''print("welcome to here")f1=open('username.txt')f2=open('password.txt')f3=open('error.txt')#建立一个Demo记录输错3次密码的用户，并对其锁定username_true=f1.readlines()#readlines读取方式返回的是逐行一个元素的列表password_true=f2.readlines()un_error=f3.readlines()f1.close()f2.close()f3.close()UK={}#建立一个字典形式为用户名对密码for i in range(len(username_true)): UK[str(username_true[i])]=str(password_true[i])#注：字典的键必须是不可变更型数据（常用整数和字符串）# 而键值可以是数字也可以是字符串#print(un_error)#print(un_error.count(777+'/n')#print(UK)count=0while count<3: username = input("Please, input your username:") password = input("Please, input your keywords") if un_error.count(str(username+'/n'))>=3:  print("Out of trying, You are Locking!")  break elif str(username+'/n') in UK and str(password+'/n')==UK.get(str(username+'/n')):  print("welcome to you, honorable customer!")  break else:  print('''Invalid customer， please try again!  And you have {count_left1} times left!'''.format(count_left1=2-count))  f3=open('error.txt','a')#建立一个Demo记录输错3次密码的用户，并对其锁定  f3.write(username+'/n')  f3.close() count += 1