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Py-heapdict
Jul 20, 2023
Heap with decrease-key and increase-key operations
heapdict implements the MutableMapping ABC, meaning it works pretty much like a regular Python dict. It’s designed to be used as a priority queue, where items are added and consumed as follows
hd = heapdict hd[obj1] = priority1 hd[obj2] = priority2 # … obj, priority = hd.popitem
Compared to an ordinary dict, a heapdict has the following differences
- popitem Remove and return the key, priority pair with the lowest priority, instead of a random object.
- peekitem Return the key, priority pair with the lowest priority, without removing it.
Unlike the Python standard library’s heapq module, the heapdict supports efficiently changing the priority of an existing object often called “decrease- key” in textbooks. Altering the priority is important for many algorithms such as Dijkstra’s Algorithm and A*.
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