auto save

diy2.py

@@ -6,6 +6,9 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if n 
-    print("用户名和密码错误!请重新输入")
+    if name!=username:
+        print("用户名错误：")
+        continue
+    if password!=userpassword:
+        print("密码错误：")   
 print("欢迎来到贝尔编程!")
\ No newline at end of file