On Sat, Feb 21, 2009 at 15:46, Aahz <a...@pythoncraft.com> wrote: > On Sat, Feb 21, 2009, Brett Cannon wrote: > > > > I am seeing two approaches emerging. One is where pickle contains all > > Python code and then uses something like use_extension to make sure > > the original Python objects are still reachable at some point. This > > has the drawback that you have to use some function to make the > > extensions happen and there is some extra object storage. > > > > The other approach is having pickle contain code known not to > > be overridden by anyone, import _pypickle for stuff that may be > > overridden, and then import _pickle for whatever is available. This > > approach has the perk of using a standard practice for how to pull in > > different implementation. But the drawback, thanks to how globals are > > bound, is that any code pulled in from _pickle/_pypickle will not be > > able to call into other optimized code; it's a take or leave it once > > the call chain enters one of those modules as they will always call > > the implementations in the module they originate from. > > To what extent do we care about being able to select Python-only on a > per-module basis, particularly in the face of threaded imports? That is, > we could have a sys.python_only attribute that gets checked on import. > That's simple and direct, and even allows per-module switching if the > application really cares and import doesn't need to worry about threads. > > Alternatively, sys.python_only could be a set, but that gets ugly about > setting from the application. (The module checks to see whether it's > listed in sys.python_only.) > > Maybe we should move this discussion to python-ideas for now to kick > around really oddball suggestions?
This is all about testing. If a change is made to some extension code it should be mirrored in the Python code and vice-versa. -Brett
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