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Heapsort is an efficient comparison-based sorting algorithm that divides an input into a sorted and an unsorted part and iteratively shrinks the unsorted part by extracting the largest element and moving that to the sorted part


Use this tag on questions about algorithms that modify the data in-place, as opposed to making a copy



But heapsort is assumed to be on average somewhat slower than standard in-place quicksort

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Why not use heap sort always

Sort the data by some unique identifier i recommend using heapsort as it s in-place generic in that you can provide a comparison function and it will work with that and you could probably look up an iterative implementation in python

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Handling millions of rows in Python

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