There are scripts you can put into Pythonista for pulling files in from Dropbox and a Gist, etc, but if you are working on a multi-file, multi-module app then syncing file by file is just way too painful. The way I do it is to run an FTP server app on the phone/iPad, connect in from my Mac and manually copy the whole directory tree. You can also export and email a zip of a directory. Snapshotting like that is survivable, but proper built-in sync or Git support is the holy grail.