Fun with Python's Newer Tools
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Look at how a Counter is implemented. See a simple word count example. Use a counter for unittests. Implement a sparse matrix.
Show how named tuples are created, combined, subclassed, and extended. See how to implement an Enum class and how to create default values.
Learn the basics of the new string formatting syntax. See how to use it for templating.
Show everyday uses for an LRU cache, look at the underlying implementation, and see how to use it to trivially solve a dynamic programming problem.