README.txt => Holds the text that will be on top of the pypi page.

setup.py => Holds the files to be packed and the characteristics of the program, that will be down on the pypi page.


See: http://guide.python-distribute.org/creation.html

Down the road, after you’ve made updates to your distribution and wish to make a new release:
1. increment the version number in your setup.py file,
2. update your CHANGES.txt file,
3. if necessary, update the “Contributors” and “Thanks also to” sections of your README.txt file.
4. run python setup.py sdist upload again.

