Python-esque parser example

[VinnyVicious]

Would be very useful to have an example on how to parse grammars like Python, where indentation is important.

[Marwes]

Usually I believe handling the indentation is handled in the lexing stage where indentation gets transformed into BLOCK_START and BLOCK_END tokens which are then parsed much as you would non-indentation based languages. It could still be a useful example on how to integrate custom lexers though in combine (even if the specific details are somewhat parser agnostic).