CherryPy was the first web framework to be made available for use with Python 3, and we tried several approaches to support both Python 2 and 3 before settling on one. Learn about the ups and the downs of each approach, and ways you can make your own porting project easier.
The CherryPy project was the first web framework to support Python 3. At the same time, we needed to continue to support and improve the Python 2 implementation. It's taken plenty of time and lots of experimentation to find out the best way. We will explore four different ways to support both Python 2 and 3, commenting on the pros and cons of each.
Python 3 change highlights
Special concerns for I/O, including WSGI
Approach 1: 2to3
Approach 2: separate branches
Approach 3: setup.py switch
Approach 4: compatibility layer
7th–15th March 2012