save project

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 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
-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")
+while True:
+    name = input("请输入用户名")
+    password = input("请输入密码")
+    if name ==username and password ==userpassword：
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+       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