The code that this article will share with you is about the preparation of Python user login interface and its implementation flow chart. Interested friends can Find out more, I hope it will be helpful to you.
The implementation code is as follows:
# 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 += 1Flow chart: 
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