What is the use of the "heapq" module in Python?

The **heapq** module in Python implements functions for converting a regular list into a heap and performing heap operations on lists. A heap is a tree-based data structure in which the parent node is always less than or equal to its children. The **heapq** module implements functions for working with heaps, such as adding and removing elements from the heap, as well as sorting a list using the heap sort algorithm. Some common functions in the **heapq** module include **heapify**, **heappush**, **heappop**, **heappushpop**, and **nlargest** and **nsmallest**.

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