I think it's simply that Ruby is used primarily for web development where Python is used in just about every field for scripting and even as a Matlab replacemen

I think it's simply that Ruby is used primarily for web development where Python is used in just about every field for scripting and even as a Matlab replacement in universities. Python web development projects are distributed randomly within the much larger python ecosystem and it's hard to know what stuff everyone's working on without a lot of crawling. With ruby\rails, even your google results on topics will be more targeted because the scope of the Ruby community is more targeted.