How To Open And Read Lzma File In-memory

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 f

Solution 1:

You can iterate through an LZMAFile object

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

Solution 2:

You can decompress incrementally. See Compression using the LZMA Algorithm. You create an LZMADecompressor object, and then use the decompress method with successive chunks of the compressed data to get successive chunks of the uncompressed data.