Idea blatantly stolen from Duukkis, who shares the final word lists here. Unless you really want to do the parsing yourself, please utilize those files directly.
$ make
It'll take two hours or so. Downloading 250M books is slow, and Voikko will take its time to process 500M'ish of Finnish text.
data/books/will contain downloaded booksdata/lists/will contain classified word lists when all is complete