save project

diy1.py

@@ -7,8 +7,12 @@ while True:
     if a==username and b==userpassword:
         print("登陆成功")
         break
+    else:
+        
         if a!=username:
             print("户名错误,请重新输入")
+        elif  :
+        
         
         if b!=userpassword:
             print("密码错误,请重新输入")