I often just want to do with easy_install is download an egg from pypi without 
installing it.  I've studied the easy_install documentation and never found a 
way to do it.  Even giving it the "-d" option results in easy-install.pth being 
created and other unwanted stuff.

Looking at the setuptools pydoc I worked out a way to do it:

>>> import setuptools
>>> d = setuptools.Distribution()
>>> d.fetch_build_egg(requirement)

Voila! the egg is downloaded into cwd.  It even seems built an egg from a 
tarball.

My question is, can I rely on this feature and is it the best way of doing what 
I want?  I'd like to use it in my code and hope it stays.  It would be ideal if 
I could do this through easy_install.

Thanks,
Stephen.
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