[Python-Dev] PEP 552: deterministic pycs

[Antoine Pitrou]

On Thu, 7 Sep 2017 18:47:20 -0700
Nick Coghlan <ncoghlan at gmail.com> wrote:
> However, I do wonder whether we could encode *all* the mode settings
> into the magic number, such that we did something like reserving the
> top 3 bits for format flags:
> 
> * number & 0x1FFF -> the traditional magic number
> * number & 0x8000 -> timestamp or hash?
> * number & 0x4000 -> checked or not?
> * number & 0x2000 -> reserved for future format changes

I'd rather a single magic number and a separate bitfield that tells
what the header encodes exactly.  We don't *have* to fight for a tiny
size reduction of pyc files.

Regards

Antoine.