uheapq
python:heapq.
This module implements the heap queue algorithm.
A heap queue is simply a list that has its elements stored in a certain way.
heappush(heap, item)
Push the item onto the heap.
heappop(heap)
Pop the first item from the heap, and return it. Raises IndexError if heap is empty.
heapify(x)
Convert the list x into a heap. This is an in-place operation.