save project

diy1.py

 username ="qwer"
-userpassword = "1111111"
+userpassword = "12345"
 while True:
     name = input("请输入账号")
     password = input("请输入密码") 
     if username == name and userpassword == password:
         print("登录成功")
         break
-    print("账号或密码输入错误,请重新输入")
+    if name != username:
+        print("用户名不存在,请重新输入")
+    if userpassword != password:
+        print("密码错误,请重新输入")
+    print("输入错误,请重新输入")
 print("欢迎来到应用")