save project

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 username != name: 
+    elif username != name: 
         print("用户名错误!请重新输入")
         continue
-    if userpassword != password:
+    else:
         print("密码错误!请重新输入")
-    print("欢迎来到贝尔编程!")
-
-        
-  
\ No newline at end of file
+   else:
+       print("登录次数已经用完") 
+       exit()    
+    print("欢迎来到贝尔编程!")
\ No newline at end of file