save project

123.py

 username = "ysz20111212"
 userpassword = "121200"
 while True:
-    name = input("用户名:")
-    password = input("密码:")
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
     if name == username and password == userpassword:
         print("登陆成功！")
         break 
-    print("用户名和密码错误！请重新输入")
+    if name != username:
+        print("用户名不存在,请重新输入")
+    if password != userpassword:
+        print("密码输入错误！请重新输入")
 print("欢迎来到贝尔编程！")