|Code Listing by David Klaffenbach|
The function combine takes multiple sequences and creates a list in which each item is constructed from items from each input sequence, and all possible combinations are created. If that description is confusing, look at the example in the docstring. It's a pretty simple transformation. The function xcombine is similar, but returns a generator rather than creating the output all at once.
A very simple idiom for implementing a state machine.
I implemented dimensions.py perhaps eight years ago as an exercise and have used it occasionally ever since.
It allows doing math with dimensioned values in order to automate unit conversions (you can add m/s to mile/hour) and...
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