After some development, I think there's a version of pywikidata which works
well enough to work with. It is still missing some features; however,
creating items, getting them by id, and saving them is covered.
You can find it here
some examples of how it works.
Finally, in case you find bugs you're welcome to report
even more to send a pull request ;). Pending things include handling
permission errors (which some time ago I couldn't trigger, I'll try now),
or getting items by interwiki.
Thanks a lot, and sorry for my English!