python-HeapDict
A 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. 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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