I wrote a PhantomJS script to download data from my bank accounts. They offer no API and disfunctional text-based exports, their websites are ridden with "good" (=terrible) web & security practices, like 3-characters-of-the-whole-password authentication, single-tab sessions, frames, etc. that makes it pretty much impossible to scrape with Python but relatively easy with a fully-fledged browser (although that still requires a lot of bank-specific boilerplate code).