I wouldn't make a blanket assumption based on a graph like that. The number of PHP installations are higher for 2 useless reasons: 1. It is trivial to see if P

I wouldn't make a blanket assumption based on a graph like that. The number of PHP installations are higher for 2 useless reasons: 1. It is trivial to see if PHP is installed on a webserver. It is not so trivial to see if Python or Ruby is. 2. PHP has a strong presence in shared hosting, which is popular for hobbyist or low traffic websites. When you take into account that big websites like Youtube, Reddit, and FriendFeed are written in Python, these graphs are downright useless.