def heappop(heap):
 lastelt = heap.pop()
 if heap:
  returnitem = heap[0]
  heap[0] = lastelt
  _siftup(heap, 0)
 else:
  returnitem = lastelt
 return returnitem

def heappop ( heap ) : lastelt = heap . pop ( ) if heap : returnitem = heap [ 0 ] heap [ 0 ] = lastelt _siftup ( heap , 0 ) else : returnitem = lastelt return returnitem
pop the smallest item off the heap .