Python is great -- I've built a bunch of stuff in it over more than a decade. Readability and ease of use are the most important for something new IMO -- you c

Python is great -- I've built a bunch of stuff in it over more than a decade. Readability and ease of use are the most important for something new IMO -- you can optimize for speed in another language if your thing gets huge, but you may not even have to -- youtube and plenty of other sites still run Python as their main frontend at larger than you're likely to get scale.