Modern Python Standard Library Cookbook

How it works...

The itertools.chain function is a very convenient one when you have to consume multiple iterables one after the other.

By default, it accepts those iterables as arguments, so we would have to do:

itertools.chain(values[0], values[1], values[2])

But, for convenience, itertools.chain.from_iterable will chain the entries contained in the provided argument instead of having to pass them explicitly one by one.