Leetcode203 remove linked list elements

# Definition for singly-linked list.
# class ListNode(object):
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution(object):
    def removeElements(self, head, val):
        """
        :type head: ListNode
        :type val: int
        :rtype: ListNode
        """


        chushihua = ListNode(-1)

        chushihua.next = head

        new = chushihua

        while new.next:
            if new.next.val == val:
                new.next = new.next.next
            else:
                new = new.next
        return chushihua.next