[Python-Dev] __file__

[Floris Bruynooghe]

On Sun, Feb 28, 2010 at 11:07:27PM +1000, Nick Coghlan wrote:
> Michael Foord wrote:
> >> Can't it look for a .py file in the source directory first (1st stat)?
> >> When it's there check for the .pyc in the cache directory (2nd stat,
> >> magic number encoded in filename), if it's not check for .pyc in the
> >> source directory (2nd stat + read for magic number check).  Or am I
> >> missing a subtlety?
> > 
> > The problem is doing this little dance for every path on sys.path.
> 
> To unpack this a little bit for those not quite as familiar with the
> import system (and to make it clear for my own benefit!): for a
> top-level module/package, each path on sys.path needs to be eliminated
> as a possible location before the interpreter can move on to check the
> next path in the list.

Aha, that was the clue I was missing.  Thanks!

Floris


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