Since I wanted to synchronize my Pythonista files with my project on GitHub I installed the iOS app "working copy" and use my little tool "gitsynchista" to move files back and forth between the local Pythonista directory tree and the WebDav server offered by "working copy".
See https://github.com/marcus67/gitsynchista for a (still very short) ReadMe and a downloadable self-extracting Python script.
Have fun!