O'ReillyNet looks at the Python class library, Pyparsing. "Pyparsing provides a basic framework for creating recursive-descent parsers, taking care of the overhead functions of scanning the input string, handling expression mismatches, selecting the longest of matching alternatives, invoking callback functions, and returning the parsed results. This leaves developers free to focus on their grammar design and the design and implementation of corresponding token processing. Pyparsing's nature as a combinator allows developers to scale their applications from simple tokenizers up to complex grammar processors. It is a great way to get started with your next parsing project!"

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