On May 24, 2018, at 10:57 AM, Antoine Pitrou
wrote: While PEP 574 (pickle protocol 5 with out-of-band data) is still in draft status, I've made available an implementation in branch "pickle5" in my GitHub fork of CPython: https://github.com/pitrou/cpython/tree/pickle5
Also I've published an experimental backport on PyPI, for Python 3.6 and 3.7. This should help people play with the new API and features without having to compile Python: https://pypi.org/project/pickle5/
Any feedback is welcome.
Thanks for doing this. Hope it isn't too late, but I would like to suggest that protocol 5 support fast compression by default. We normally pickle objects so that they can be transported (saved to a file or sent over a socket). Transport costs (reading and writing a file or socket) are generally proportional to size, so compression is likely to be a net win (much as it was for header compression in HTTP/2). The PEP lists compression as a possible a refinement only for large objects, but I expect is will be a win for most pickles to compress them in their entirety. Raymond