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The PyParsing homepage touts Getting Started with Pyparsing as a great reference for the library. However, it was published in 2007—which makes it 7 years out of date. Is it still a viable reference at this point?
I'm writing some code that others might maintain in the future, and I was thinking of getting my manager to purchase the eBook as a reference for anyone who might want to edit the parser in the future. However, if the material is significantly out of date then it might confuse more than it helps, in which case I'm probably better off just heavily commenting my code and pointing at the API as a reference.