class_docstr: Linked list structure with list of VectorNodes as elements.
class_docstr_tok: ["Linked","list","structure","with","list","of","VectorNodes","as","elements","."]
docstr: Append a node to the `index`-th position.
docstr_tok: ["Append","a","node","to","the","`","index","`","-th","position","."]
code: def append(self, node: VectorNode, index: int) -> None:
      """Append a node to the `index`-th position."""
      current_last = self.sentinel.prev[index]
      assert current_last is not None
      node.next[index] = self.sentinel
      node.prev[index] = current_last
      self.sentinel.prev[index] = node
      current_last.next[index] = node
  
imports: import typing
  import numpy
label_desc: Use image node_id 7 for calling the VectorLinkedList obj's underlying member method code with example usage: obj.append(node, index) without return types