auto save

diy2.py

-username = "python"
-userpassword = "123456"
-i=3
-while True:
-    if i>0:
-        name = input("请输入用户名:")
-        password = input("请输入密码:")
-        i-=1
-        if name == username and password == userpassword:
-            print("登录成功!")
-            break 
-        if  name != username:
-            print("账号错误!") 
-            continue  
-        if  password == userpassword:
-            print("密码错误!")
-    else:
-         print("账号已锁定")  
-         exit()     
-print("欢迎来到贝尔编程!")
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