[issue17004] Expand zipimport to include other compression methods

[Raymond Hettinger]

Raymond Hettinger added the comment:

xz will likely be the best win -- it is purported to compress smaller than bz2 while retaining the decompression speed of zip.

As Antoine says, the usual practice is to add py, pyc, and pyo files to the compressed library; otherwise, there is an added cost with Python tries to write a missing pyc/pyo file.

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<http://bugs.python.org/issue17004>
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