Ruby is commonly used by programmers along with Ruby on Rails for Web Development so it's scope is very limited. Python on the other hand has been widely adopted by the academia and has become pretty much essential to startups in the big data/AI sector, additionally Python can also be used with Django for web development (Instagram's website is built in Django). The pip library is vast and the Django community is on par with the Ruby on Rails community. I dont see any reason to stick with Ruby.