save project

diy1.py

@@ -9,10 +9,9 @@ while True:
     if a==username and b==userpassword:
         print("登陆成功")  
         break
-    if a!=username:
+    elif a!=username:
         print("用户名错误")
-        continue
-    if b!=userpassword:
+    elif b!=userpassword:
         print("密码错误")
 print("欢迎来到贝尔编程")