PEP 3147 - new .pyc format

[MRAB]

John Bokma wrote:
> MRAB <python at mrabarnett.plus.com> writes:
> 
>> Alf P. Steinbach wrote:
>>> * John Bokma:
>>>> MRAB <python at mrabarnett.plus.com> writes:
>>>>
>>>>> The PEP has a .pyr directory for each .py file:
>>>>>
>>>>>     foo.py
>>>>>     foo.pyr/
>>>>>         f2b30a0d.pyc # Python 2.5
>>>>>         f2d10a0d.pyc # Python 2.6
>>>>>         f2d10a0d.pyo # Python 2.6 -O
>>>>>         f2d20a0d.pyc # Python 2.6 -U
>>>>>         0c4f0a0d.pyc # Python 3.1
>>>> wow: so much for human readable file names :-(
>>> I agree.
>>>
>>> Human readable filenames would be much better.
>>>
>> The names are the magic numbers. It's all in the PEP.
> 
> Naming files using magic numbers is really beyond me. The fact that the
> above needs comments to explain what's what already shows to me that
> there's a problem with this naming scheme. What if for one reason or
> another I want to delete all pyc files for Python 2.5? Where do I look
> up the magic number?
> 
True. You might also want to note that "Python 2.6 -U" appears to have a
different magic number from "Python 2.6" and "Python 2.6 -O".

I don't know whether they always change for each new version.