save project

diy2.py

@@ -6,10 +6,10 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name != username:
+    elif name != username:
         print("用户名不存在!请重新输入")
         continue
-    if password != userpassword:
+    else :
         print("密码错误!请重新输入")
     #print("用户名和密码错误!请重新输入")
 print("欢迎来到贝尔编程!")