This apparently doesn't work correctly. When I tried it, a bunch of log lines were duplicated. 😞

class LzmaFileHandler(FileHandler):
    def _open(self) -> IO[str]:
        return lzma.open(
            self.baseFilename,
            self.mode,
            encoding=self.encoding,
            errors=self.errors,
        )

I had to switch it to this to get it to work:

class CompressionAlgorithm(Enum):
    lzma = "lzma"
    gzip = "gzip"
    bzip2 = "bzip2"


def _compressed_handler(
    opener: Callable[[Path, str], IO[str]],
    filename: Path,
    mode: str = "at",
) -> logging.Handler:
    stream = opener(filename, "at")
    stream.reconfigure(write_through=True)
    atexit.register(stream.close)
    return StreamHandler(stream)
 
 
COMPRESSION_HANDLERS: Mapping[CompressionAlgorithm, Callable[[Path, str], logging.Handler]] = {
    CompressionAlgorithm.lzma: partial(_compressed_handler, lzma.open),
    CompressionAlgorithm.gzip: partial(_compressed_handler, gzip.open),
    CompressionAlgorithm.bzip2: partial(_compressed_handler, bz2.open),
}

Also, lzma buffers a ton in memory before writing, so it didn't really work for my purpose. Even bz2 didn't work, so I had to use gzip. 🙃

#Python