I thought now that there's no Open in... anymore, I'd build a little UI/script to get files from Dropbox into Pythonista more easily:
→ Dropbox File Picker.py (GitHub)
It's pretty basic – once you've completed the setup (you need to configure some things in the Dropbox Dev Center), you'll get a list of folders and files in your Dropbox. You can drill down the folder hierarchy and download files one at a time. They're saved to the root folder of the Pythonista script library; if a file with the same name already exists, a numeric suffix is appended automatically. The UI could be prettier, but it gets the job done.
