Sorting a mix of letters and numbers in Python

It's easy to sort numbers in Python, and even to sort strings -- but what if you have a mix of the two? This question came up in corporate training that I did yesterday, and I decided to review the answer here, using a combination of strings, lists, tuples, and list comprehensions.

Jupyter notebooks from this video, and all of my videos, are at https://github.com/reuven/youTube-notebooks .

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