On Tue, Apr 17, 2012 at 13:45, Philip Jenvey <pjen...@underboss.org> wrote:
> > On Apr 14, 2012, at 1:03 PM, Brett Cannon wrote: > > > And lastly, sticking None in sys.path_importer_cache would no longer > mean "do the implicit thing" and instead would mean the same as > NullImporter does now (which also means import can put None into > sys.path_importer_cache instead of NullImporter): no finder is available > for an entry on sys.path when None is found. > > Isn't it more explicit to cache the NullImporter instead of None? > I disagree. NullImporter is just another finder that just so happens to always fail. None is explicitly not a finder and thus obviously not going to do anything. Isn't it clearer to say ``sys.path_importer_cache[path] is None`` than ``isinstance(sys.path_importer_cache[path], imp.NullImporter)``? I mean we have None to represent something is nothing which is exactly what I want to convey; None in sys.path_importer_cache means there is no finder for that path.
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