[Python-Dev] [compatibility-sig] making sure importlib.machinery.SourceLoader doesn't throw an exception if bytecode is not supported by a VM (original) (raw)

Amaury Forgeot d'Arc amauryfa at gmail.com
Tue Jun 12 19:02:02 CEST 2012

2012/6/12 Alex Gaynor <alex.gaynor at gmail.com>

On Tue, Jun 12, 2012 at 11:47 AM, Brett Cannon <brett at python.org> wrote:

On Tue, Jun 12, 2012 at 12:38 PM, Alex Gaynor <alex.gaynor at gmail.com>wrote: For PyPy: I'm not an expert in our import, but from looking at the source 1) imp.cachefromsource is unimplemented, it's an AttributeError. Well, you will have it come Python 3.3 one way or another. =) Sure, I'm not totally up to speed on the py3k effort.

It's indeed implemented in pypy's py3k branch.

2) sys.dontwritebytecode is always false, we don't respect that flag (we really should IMO, but it's not a high priority for me, or anyone else apparently) But doesn't PyPy read and write .pyc files ( http://doc.pypy.org/en/latest/config/objspace.usepycfiles.html suggests you do)? So I would assume you are not affected by this. Jython and IronPython, though, would be (I think). This is a compile time option, not a runtime option. However, it looks like I lied, someone did implement it correctly, so we have the same behavior as CPython.

Yes, PyPy seems to respect sys.dontwritebytecode.

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