On 6 May 2018 at 05:34, Brett Cannon <br...@python.org> wrote: > > > On Sat, 5 May 2018 at 10:41 Eric Fahlgren <ericfahlg...@gmail.com> wrote: > >> On Sat, May 5, 2018 at 10:30 AM, Toshio Kuratomi <a.bad...@gmail.com> >> wrote: >> >>> On Fri, May 4, 2018, 7:00 PM Nathaniel Smith <n...@pobox.com> wrote: >>> >>>> What are the obstacles to including "preloaded" objects in regular .pyc >>>> files, so that everyone can take advantage of this without rebuilding the >>>> interpreter? >>>> >>> >>> Would this make .pyc files arch specific? >>> >> >> Or have parallel "pyh" (Python "heap") files, that are architecture >> specific... >> > > .pyc files have tags to specify details about them (e.g. were they > compiled with -OO), so this isn't an "all or nothing" option, nor does it > require a different file extension. There just needs to be an appropriate > finder that knows how to recognize a .pyc file with the appropriate tag > that can be used, and then a loader that knows how to read that .pyc. >
Right, this is the kind of change I had in mind (perhaps in combination with Diana Clarke's suggestion from several months back to make pyc tagging more feature-flag centric, rather than the current focus on a numeric optimisation level). We also wouldn't ever generate this hypothetical format implicitly - similar to the new deterministic pyc's in 3.7, they'd be something you had to explicitly request via a compileall invocation. In the Linux distro use case then, the relevant distro packaging helper scripts and macros could generate traditional cross-platform pyc files for no-arch packages, but automatically switch to the load-time optimised arch-specific format if the package was already arch-specific. Cheers, Nick. -- Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia
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