Проблема в LinkedList не обращая

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reversing a linkedlist using 3 pointer?
cant understand what is the problem?
pls suggest any other iterative solution too.. 
reversing a linkedlist using 3 pointer?
cant understand what is the problem?
pls suggest any other iterative solution too..

outcome should be 87654321(reverse of a linkedlist)
but currently the output is 1
i think there is problem in reverse function pointers
    
#reversing a linkedlist
    class Node:
        def __init__(self,data):
            self.data=data
            self.next=None
    class LinkedList:
        def __init__(self):
            self.head=None
        def push(self,data):
            new_node=Node(data)
            new_node.next=self.head
            self.head=new_node
        def printlist(self):
            temp=self.head
            print()
            while temp:
                print(temp.data,end=' ')
                temp=temp.next
        def append(self, new_data): 
            new_node = Node(new_data) 
            if self.head is None: 
                self.head = new_node 
                return
            last = self.head 
            while (last.next): 
                last = last.next
            last.next =  new_node
        def reverse(self):
            prev=None
            current=self.head
            nnext=current.next
            while nnext:
                current.next=prev
                prev = current
                current = nnext
                nnext=nnext.next
            current.next=prev
    if __name__=='__main__':
        llist=LinkedList()
        llist.append(1)
        llist.append(2)
        llist.append(3)
        llist.append(4)
        llist.append(5) 
        llist.append(6)
        llist.append(7)
        llist.append(8)
        llist.printlist()
        llist.reverse()
        llist.printlist()

Что я уже пробовал:

есть некоторая проблема с указателями моей обратной функции

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