How to open and read LZMA file in-memory

Question

I have a giant file, let's call it one-csv-file.xz. It is an XZ-compressed CSV file.

How can I open and parse through the file without first decompressing it to disk? What if the file is, for example, 100 GB? Python cannot read all of that into memory at once, of course. Will it page or run out of memory?

Answer 1

You can iterate through an LZMAFile object

import lzma  # python 3, try lzmaffi in python 2
with open('one-csv-file.xz') as compressed:
    with lzma.LZMAFile(compressed) as uncompressed:
        for line in uncompressed:
            do_stuff_with(line)