save project

sb.py/diy.py

 username="sb"
-userpassword="860826"
+userpassword=
 while True:
     name=input("请输入账号")
     password=input("请输入密码")
     if name==username and userpassword ==password
         print("登陆成功")
         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
+    if username！="sb"
+        print("用户名不存在，请重新输入")
+    if password！="860826"
+        print("密码不存在,请重新输入")
\ No newline at end of file