save project

diy2.py

@@ -6,5 +6,7 @@ while True:
     if name == username and password == userpassword:
     if name == username and password == userpassword:
         print("登录成功!")
         print("登录成功!")
         break
         break
-    if :
+    if name!= username:
+        print("账户不存在，请重新输入!")
+    if name!= userpassword:
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
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