Reading this to see if I missed anything while downloading the new release:In total, almost 500 API items are new or improved in Python 3.3. For a more extensive list of changes in 3.3.0, see http://docs.python.org/3.3/whatsnew/3.3.html
For the common user, this change should result in no visible change in semantics. Any possible changes required in one’s code to handle this change should read the Porting Python code section of this document to see what needs to be changed, but it will only affect those that currently manipulate import or try calling it programmatically.