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

[Alex Gaynor]

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.cache_from_source 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.


>
>> 2) sys.dont_write_bytecode 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.

Alex


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