import heapq
heap = []
heapq.heappush(heap, 3)
heapq.heappush(heap, 2)
heapq.heappush(heap, 5)
print(heap) # [2, 3, 5]
import heapq
heap = []
heapq.heappush(heap, -3)
heapq.heappush(heap, -2)
heapq.heappush(heap, -5)
print(heap) # [-5, -3, -2]