I want to start learning how to parse fragments of text -mostly, snippets of code in a custom language-, using Python. But I'm at a loss since all the material I find seems to be quite advanced, or at least it's terminology it's to foreign to me.

So, is there any tutorial "for dummies"-style on parsing custom languages with Python? Could you perhaps point me to any good material? I know that there are many packages for parsing (PyParse, modgrammar, etc), but besides I needing some introductory material, I also am not clear as to wether they would work with Python 3.6 or not.

Any advice would be welcome. Thank you in advance.

There is "Text processing with Python" which looks like a good starting point. http://gnosis.cx/TPiP/

Never read it myself, as a glance through the table of contents suggested I know most of it.

Python versions are not that interesting, plain string operations haven't changed much. In addition, newer Python typically get new things added, and very little (if any) things removed, so you should be ok with anything Python 3. In fact even 2.6 and 2.7 will mostly work, as these version moved a lot towards Python 3 already. Biggest difference between 2 and 3 is how data 'outside' and data 'inside' is now strictly separated. You get that when writing or reading files, but those are standard patterns, so once you know them, it's no problem.

As for parsers, I always use PLY ( http://www.dabeaz.com/ply/ ), which is "Python Lex & Yacc". Lex and Yacc are the defacto standard tools to write parsers for production compilers, they are old tools, and the C version is all over the Internet, and in compiler construction books.