how to add custom importer after the normal imports

Gelonida N gelonida at
Thu Oct 9 14:51:17 CEST 2014

On 10/9/2014 12:44 AM, Ian Kelly wrote:
> On Wed, Oct 8, 2014 at 4:53 AM, Gelonida N <gelonida at> wrote:
>> Hi,
>> I just read about sys.meta_path, which allows to install custom importers
>> *BEFORE* the default importers.
>> However I have a use case where I would like to add a custom importer
>> *AFTER* all other import methods have failed.
>> Does anybody know how to do this.
>> One way of implementing this would be to add the default importer as first
>> entry in sys.meta_path. My only problem is, that I don't know how to create
>> a 'default-importer', such that I can add it into sys.meta_path
> As of CPython 3.3 the default importers are already in sys.meta_path,
> so you could just add your custom importer to the end. If you need to
> support earlier versions or alternate implementations then this may
> not be reliable.
thanks for your answer.

I'm using Puthon 2.7 for the given project and there sys.meta_path is [].

Just for fun I started Python3.3 and looked at it's meta_path, which 
contained for example _frozen_importlib.PathFinder

Unfortunately python 2.7 does not seem to have the package _frozen_importlib

So now the question seems to boil down to looking for the 2.7 equivalent 
of python 3.3's _frozen_importlib.PathFinder

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