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Monkey patch the standard zipfile module to enable accelerated deflate via isal

Project description



Monkey patch the standard zipfile module to enable accelerated deflate support via isal.

Based on zipfile-deflate64 and zipfile-zstandard, which provides similar functionality but for the deflate64 algorithm. Unlike zipfile-deflate64, this package supports both compression and decompression.

Requires isal (and slz optionally).

Note: if you need Python2, use zipfile39 instead (it is also compatible with Python3).


pip install zipfile-isal


Anywhere in a Python codebase:

import zipfile_isal  # This has the side effect of patching the zipfile module to support isal

Alternatively, zipfile_isal re-exports the zipfile API, as a convenience:

import zipfile_isal as zipfile


Compression example:

import zipfile_isal as zipfile

zf = zipfile.ZipFile('/tmp/', 'w', zipfile.ZIP_DEFLATED, compresslevel=-12)


  • -10, -11, -12, -13 correspond to isal 0, 1, 2, 3
  • -21 corresponds to slz
  • 11 to 19 correspond to 7-zip 1-9

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