Also, another possible solution I thought of to use data files from Dropbox in Pythonista: you can "open" the data file in Pythonista, use editor.get_path() to get its full path, and then hardcode that into your script. As far as I can tell, once Pythonista has "opened" a file from Dropbox, it is allowed to access it forever, even after you close the editor tab for the file. Of course this is far from optimal, it requires modifying every script to use the full paths, and it only works if the data file has a file extension that Pythonista accepts.
