[Import-SIG] PEP for the removal of PYO files

Ethan Furman ethan at stoneleaf.us
Fri Feb 27 19:36:20 CET 2015

On 02/27/2015 10:28 AM, Barry Warsaw wrote:
> from the PEP:

>> The "opt-" prefix was chosen so as to provide a visual separator
>> from the cache tag. The placement of the optimization level after
>> the cache tag was chosen to preserve lexicographic sort order of
>> bytecode file names based on module name and cache tag which will
>> not vary for a single interpreter. The "opt-" prefix was chosen over
>> "o" so as to be somewhat self-documenting. The "opt-" prefix was
>> chosen over "O" so as to not have any confusion with "0" while being
>> so close to the interpreter version number.
> I get it, and the examples you include in the open questions is helpful, but I
> still don't like "opt-".  We'll no doubt bikeshed on this until Guido
> decides but looking at the examples below I'd be okay with 'O<level>'.  Did
> you consider 'opt<level>', e.g. imporlib.cpython-35.opt0.pyc ?

I can live with either '.opt-N.' or just '.optN.' but all the others I thought were horrid.

>> Compatibility Considerations
>> ============================
> Just as PEP 3147 had to make backward compatibility concessions to .pyc files
> living outside __pycache__ (which I think is still supported, right?) I think
> you'll have to do the same for traditional .pyo files, at least for Python
> 3.5.  You won't have to *write* such files, but if they exist and the
> corresponding optimization level pyc file isn't present in __pycache__, you'll
> have to load them.
> It might in fact make sense to add some language to this PEP saying that in
> Python 3.6, support for old-style .pyc and .pyo files will be removed.



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