How to use "groupby()", which is a very powerful function provided by the itertools module, with Python.  The groupby() is a fundamental and powerful data analysis technique in data analysis.  It allows you to group categories and apply functions to them efficiently, making it essential for handling large datasets.  Its ability to aggregate data with minimal code and high performance makes it invaluable for real-world projects.

The Python itertools module provides a collection of fast, memory-efficient tools for creating and working with iterators. The groupby() function is a powerful tool for grouping elements from an iterable.  Link below to a video with more information Groupby() in Python, when working with the itertools module.

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