[Distutils] pakage index __getitem__

[Jim Fulton]

I want to get a list of all of the distributions I can find that  
satisfy a requirement.  I've found the following works:

   index.obtain(requirement)
   dists = [d for d in index[requirement.project_name] if d in  
requirement]

where index is a setuptools.package_index.PackageIndex.

Is there a better way?  The obtain call seems to be necessary to  
initialize the index for the given project.

Jim

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