Mailman, the original BitTorrent client, Gentoo's Portage/emerge tools, yum, Eve Online, and a large swathe of 90s-era Red Hat Linux system configuration tools

Mailman, the original BitTorrent client, Gentoo's Portage/emerge tools, yum, Eve Online, and a large swathe of 90s-era Red Hat Linux system configuration tools have all been written in Python, all predating Django and your "Ruby backlash" timescale by at least 2-3 years. And not one of them is web-related. Most of the code that gets written in Python has nothing to do with web development. Web development is just high-profile.