Hi,
I've written a little exported script to grab animations + tilesets from PyxelEdit files and pack them into spritesheets.
Someone else might find it useful, even if only as a starting point to make their own little exporter.
Big thank you to Danik for not only creating PyxelEdit but giving it one of the most straightforward and sanest file formats I've seen :)
https://github.com/joeyspacerocks/pexpo