Python的用户登录接口编制以及实现流程图

# Author: Steven Zeng

'''

作业：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=0

while 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