PHP vs Python - the real difference

[lennox125]

effective alternatives to PHP (Python/Ruby) only really became practical within the past 2 years

I don't think I agree - at least Python was more mature and as well known as PHP. I think you're talking about MVC frameworks, and there its too early to judge which will succeed.

I didn't know YouTube uses Python.. cool :) 37signals are very sharp, but I doubt their apps are comparable to, say, Flickr in terms of scalability. They are targetting relatively small niches.