@JJ, You need to put the contents of forecast.pyui into a local file of the same name however you can not do this directly from the Pythonista Editor because it has the nasty habit of naming your file forecast.pyui.py which is not what you want. So you need to use one of the solutions found in http://omz-forums.appspot.com/pythonista/post/5826992532357120 for downloading or creating the local forecast.pyui file.
