Python, not PHP

The first few posts of this blog dealt with PHP and Zend Framework. I am now leaving PHP behind. I am going to focus on using Python and Django (probably a few others: Flask and web.py look great for small sites) from now on.
This leads to a question: why?
First, I have dabbled in Python and liked it. I had created a few simple Google App Engine sites. I used webapp (an App Engine framework) to build them.