I have a Python module that I would like to upload to PyPI. So far, it is working for Python 2.x. It shouldn't be too hard to write a version for 3.x now.

But, after following guidelines for making modules in these places:

• Distributing Python Modules
• The Hitchhiker’s Guide to Packaging

it's not clear to me how to support multiple source distributions for different versions of Python, and it's not clear if/how PyPI could support it. I envisage I would have separate code for:

• 2.x
• 2.6 (maybe, as a special case to use the new buffer API)
• 3.x

How is it possible to set up a Python module in PyPI so that someone can do:

easy_install modulename

and it will install the right thing whether the user is using 2.x or 3.x?