The Flask author's post about issues he has faced with Python 3 might give some insight to that: http://lucumr.pocoo.org/2011/12/7/thoughts-on-python3/ http://l

The Flask author's post about issues he has faced with Python 3 might give some insight to that: http://lucumr.pocoo.org/2011/12/7/thoughts-on-python3/ http://lucumr.pocoo.org/2011/12/7/thoughts-on-python3/