Remove Nth Node From End of List

def removeNthFromEnd(head, n):
    dummy = ListNode(0, head)
    left = dummy
    right = head
    
    while n > 0 and right:
        right = right.next
        n -= 1
        
    while right:
        left = left.next
        right = right.next
        
    left.next = left.next.next
    return dummy.next