zipfile39

• Backport of zipfile Python 3.9 (especially caae717) to older Python including Python 2.7.
  • This means Python 2.7 can use zf.open(name, 'w').
• Uses backports.lzma for ZIP_LZMA (method 14) Python2 handler.
• Introduces ZIP_DEFLATED64 (method 9), ZIP_DCLIMPLODED (method 10), ZIP_ZSTANDARD(method 93), ZIP_XZ (method 95) and ZIP_PPMD (method 98) handlers.
  • ZIP_ZSTANDARD Python2 uses zstandard 0.14.1 (the last compatible version).
  • isal / pyppmd / zipfile_deflate64 Python2 use my own backport.
• If isal is installed:
  • crc32 and inflation are accelerated automatically.
  • ZIP_DEFLATED compresslevel -10, -11, -12 and -13 are available, which correspond to isal compression level 0, 1, 2 and 3.
• If slz is installed:
  • ZIP_DEFLATED compresslevel -21 is available.
• If codecs7z is installed:
  • ZIP_DEFLATED/ZIP_BZIP2 compresslevel 11 - 19 are available. Enjoy 7-zip's ultimate compression on Python.

Requisites

• Installation requisites:
  • pathlib2 (Python2 only)
  • contextlib2 (Python2 only)
• Optional requisites:
  • backports.lzma (Python2 only)
  • dclimplode
  • zstandard or pyzstd (Py2 unavailable)
  • isal
    • Python2 need python -m pip install git+https://github.com/cielavenir/python-isal-py2@0.11.0-py2
      • (now this branch support macOS as well)
    • Also see https://github.com/cielavenir/python-isal-py2/releases/tag/v0.11.1-py2
  • slz
  • codecs7z
  • pyppmd
    • Python2 need python -m pip install git+https://github.com/cielavenir/pyppmd-py2@py2
    • Also see https://github.com/cielavenir/pyppmd-py2/releases/tag/v0.17.0.1
  • zipfile_deflate64
    • Need 0.2.0 or later.
    • Python2 need python -m pip install git+https://github.com/cielavenir/zipfile-deflate64@py2
    • Also see https://github.com/cielavenir/zipfile-deflate64/releases/tag/v0.2.0.4
    • or inflate64 (Py2 unavailable)
• Test requisites:
  • All optional requisites
  • backports.tempfile (Python2 only)
  • funcsigs (Python2 only)

Wheels

Some dependencies need complex build procedures. For your sake those wheels are published in actions CI.

Legal

• I'm not sure about the license term when pyppmd / codecs7z / inflate64 is loaded (I'm not lawyer though).
  • For pyppmd, note that PPMd code itself is public domain. See miurahr/pyppmd#5 (comment) for detail.