Real Python - Counting With Python's Counter
https://realpython.com/courses/counting-python-counter/
Counting several repeated objects at once is a common problem in programming. Python offers a bunch of tools and techniques you can use to approach this problem. However, Python’s Counter from collections provides a clean, efficient, and Pythonic solution.
This dictionary subclass provides efficient counting capabilities out of the box. Understanding Counter and how to use it efficiently is a convenient skill to have as a Python developer. In this video course, you’ll learn how to Count several repeated objects at once Create counters with Python’s Counter Retrieve the most common objects in a counter Update object counts Use Counter to facilitate further computations Implement Counter instances as multisets 
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