1. Zen of Python. (since Ruby doesn't adhere to it, it's bad)
2. Python community is less arrogant compared to Ruby community. (painting millions of Ruby programmers with the same brush based on an IRC chat they had)
3. Google loves Python. (is that even a reason?)
4. Zed Shaw said so-and-so against Ruby/Rails which I want to believe/agree. (fan mentality)