[Zope3-dev] Zip import and sys.path manipulation (was Re: directory hierarchy proposal)

[Phillip J. Eby]

(Summary: good plan for name and place, issues exist w/sketched implementation)

At 10:47 AM 12/16/02 -0500, Guido van Rossum wrote:

>Time's running short (we're close to releasing Python 2.3 alpha 1);
>we should decide on a name and a specific policy ASAP.  I propose the
>following:
>
>   from pkgutil import extended_path
>   __path__ = extended_path(__path__, __name__)

How would that work for say, 'zope.app'?


>Where pkgutil.py could be something like this:
>
>   import sys.path
>
>   def extended_path(path, name):
>       """Extend a package's path.  (XXX more.)"""
>       path = path[:]
>       for dir in sys.path:
>           if isinstance(dir, (str, unicode)):
>               dir = os.path.join(dir, name)
>               if dir not in path and os.path.isdir(dir):
>                   path.append(dir)
>       return path
>
>--Guido van Rossum (home page: http://www.python.org/~guido/)

The 'isdir()' part isn't going to work on zipfiles...  unless os.path is 
going to have zipfile support in 2.3.  :)