save project

diy2.py

@@ -2,9 +2,13 @@ username = "python"
 userpassword = "123456"
 while True:
     name = input("请输入用户名:")
+    if not name==username:
+        print("没有此用户！")
+    else:    
         password = input("请输入密码:")
-    if name == username and password == userpassword:
+        if  not password==userpassword:
+            print("账号与密码不匹配！")
+        else:
             print("登录成功!")
             break
-    print("用户名和密码错误!请重新输入")
 print("欢迎来到贝尔编程!")
\ No newline at end of file