I have done project, but it doesn't match result,please fix it

Programming

Question Description

Linked lists

This assignment focuses on linked lists. Your task is to implement a doubly-connected linked list with two dummy sentinel nodes. Each node in the list contains a value, and two pointers (_prev, _next) which refer to the nodes before and after it in the list. In addition, there are sentinel nodes (the head and tail nodes) at the very start and end of the list; each of these dummy nodes holds the value None, and has one None pointer: the head node has head._prev == None and the tail node has tail._next == None. All other pointers refer to actual nodes. Here is a sketch of the list [1, 2]:

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