On 2018年7月10日 02:53:47 +0100 MRAB <[email protected]> wrote: > In the regex module I use an encoding scheme when pickling pattern > objects which is based on the way MIDI encodes variable-length integers, > and I think it might have a use in a pickle protocol. > > In the basic format, an integer is split up into 7-bit chunks, each > chunk put into a byte, and the most-significant bit of the byte used to > signal whether the value continues into the following byte. > > And integer must be encoded into the minimum number of bytes, so an > encoded sequence of bytes would never start with 0x80.
The problem with variable-length encoding is that you need more individual reads to fetch a datum. The whole point of pickle framing is to replace many small reads with a few large reads, and variable-length encoding is adversial to that goal. Regards Antoine. _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com