[Python-Dev] importlib is now bootstrapped (and what that means)

Brett Cannon brett at python.org
Fri Apr 20 16:59:25 CEST 2012

On Fri, Apr 20, 2012 at 09:54, Eric V. Smith <eric at trueblade.com> wrote:

> On 04/14/2012 02:12 PM, Brett Cannon wrote:
> > My multi-year project -- started in 2006 according to my blog -- to
> > rewrite import in pure Python and then bootstrap it into CPython as
> > *the* implementation of __import__() is finally over (mostly)!
> Maybe I'm missing something, but it seems that I need to run
> importlib._bootstrap._install(sys, _imp) manually in order to make
> __import__ be importlib's version. Is that not supposed to happen
> automatically?

It's happening automatically. If you look in Python/import.c you will
notice that the code that __import__() eventually calls is calling out into
the Python code. There is still some C code in order to accelerate the case
of hitting sys.modules.
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