Heap Implementation

[Cem Karan]

On Feb 9, 2016, at 4:40 AM, Mark Lawrence <breamoreboy at yahoo.co.uk> wrote:

> On 09/02/2016 04:25, Cem Karan wrote:
>> 
>> No problem, that's what I thought happened.  And you're right, I'm looking for a priority queue (not the only reason to use a heap, but a pretty important reason!)
>> 
> 
> I'm assuming I've missed the explanation, so what is the problem again with https://docs.python.org/3/library/queue.html#queue.PriorityQueue or even https://docs.python.org/3/library/asyncio-queue.html#asyncio.PriorityQueue ?

Efficiently changing the the priority of items already in the queue/deleting items in the queue (not the first item).  This comes up a LOT in event-based simulators where it's easier to tentatively add an event knowing that you might need to delete it or change it later.

Thanks,
Cem Karan