[Python-Dev] how important is setting co_filename for a module being imported to what __file__ is set to?

[P.J. Eby]

At 01:39 PM 8/31/2009 -0700, Brett Cannon wrote:
>On Mon, Aug 31, 2009 at 12:59, Brett Cannon<brett at python.org> wrote:
> > On Mon, Aug 31, 2009 at 12:27, Antoine Pitrou<solipsis at pitrou.net> wrote:
> >> Brett Cannon <brett <at> python.org> writes:
> >>>
> >>> I will plan to take this approach then;
> >>> http://bugs.python.org/issue6811 will track all of this. Since this is
> >>> a 3.2 thing I am not going to rush to implement this.
> >>
> >> I still don't understand what the point is of this complicated 
> approach (adding
> >> an argument to marshal.load()) compared to the simple and obvious approach
> >> (making co_filename mutable).
> >
> > If we add the argument to marshal.load* we can eventually drop the
> > file location string from marshal data entirely by requiring people to
> > specify the filename to use when the code object is created. Making
> > co_filename mutable simply doesn't allow for this case unless we
> > decide a default value should be used instead.
> >
>
>I should also mention that I am +0 on the marshal.load* change. I
>could be convinced to try to pursue a mutable co_filenme direction,
>but considering the BDFL likes the marshal.load* approach and it opens
>up the possibility of compacting the marshal format I am leaning
>towards sticking with this initial direction.

Why not just try the code I posted earlier, that doesn't need a 
mutable attribute OR an API change?