python count group by

Title: Python collections.Counter and groupby Tutorial
Introduction:
The Counter class is part of the collections module in Python and is used for counting occurrences of elements in a collection, typically a list or a string.
The groupby function from the itertools module is used to group elements of an iterable based on a key function.
In this example, we count the occurrences of each element in my_list using Counter and then group the elements based on their parity using groupby. This demonstrates how these two tools can be combined for more complex analyses.
Conclusion:
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