True. The post calls out that “you have to recompress the training data for each test document” with zlib (otherwise input_text would taint it), but you can actually call Compress.copy().

zdict was added in Python 3.3, though, so it’s 2012, not 1997. (It might have worked before, just not a part of the official API :-)

Ah, okay. Didn't realize that. I used either zlib or gzip long, long ago but never messed with the `zdict` param. Thanks for pointing that out.