Who this book is not for

If you don't fit into one of these categories, you're doing well already:

• People who want more pictures than words

• People who don't trust open-source software

• People who aren't willing to commit a little time each day or every few days to try out code examples for themselves

I cite the last category particular because of Flip Wilson's law: "You can't expect to hit the jackpot if you don't put a few nickels in the machine".

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