剑指offer python版 删除链表中重复的结点

class ListNode(object):
    def __init__(self,x):
        self.val=x
        self.next=None
        
class Link(object):
    def __init__(self,values=None):
        self.nodes=self.set_link(values) if  values else None
        
    def get_link(self):
        return self.nodes
    def set_link(self,values):
        if not values :
            return False
        head=ListNode(0)
        move=head
        
        
        try:
            for i in values:
                tmp=ListNode(i)
                move.next=tmp
                move=move.next
                
        except Exception as e:
            print(e)
            
        return head.next

def deleteDuplication(self, pHead):
    first = ListNode(-1) 
    first.next = pHead 
    last = first
    while pHead and pHead.next:
        if pHead.val == pHead.next.val: 
            val = pHead.val 
            while pHead and val==pHead.val:
                pHead = pHead.next 
            last.next = pHead 
        else: 
            last = pHead 
            pHead = pHead.next 
            return first.next