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Can people point me to resources on lexing, parsing and tokenising with Python? I'm doing a little hacking on an open source project ( hotwire ) and wanted to do a few changes to the code that lexes , parses and tokenises the commands entered into it. As it is real working code it is fairly complex and a bit hard to work out. I haven't worked on code to lex/parse/tokenise before, so I was thinking one approach would be to work through a tutorial or two on this aspect. I would hope to learn enough to navigate around the code I actually want to alter. Is there anything suitable out there? (Ideally it could be done in an afternoon without having to buy and read the dragon book first ...) Edit: (7 Oct 2008) None of the below answers quite give what I want. With them I could generate parsers from scratch, but I want to learn how to write my own basic parser from scratch, not using lex and yacc or similar tools. Having done that I can then understand the existing code better. So could someone point me to a tutorial where I can build a basic parser from scratch, using just python?

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