code: def push(self, node):
      heapq.heappush(self.data, PQNode(node))
  
file_path: coding-problems/Linked Lists/merge_k_sorted_ll.py
imports: from ll_helpers import ListNode
  import heapq
label_desc: Use image node_id 2 for calling the PriorityQueue obj's underlying member method code with example usage: obj.push(node) without return types