ok solved, the Xcode project should automatically download that file the first time it's built. If that didn't work for some reason, you can manually download it here (you need to unpack it, and put it in the "Pythonista/lib" folder):
http://omz-software.com/pythonista/download/libpythonista3.a.gz

Sorry, I'm not able to find library libpythonista3.a, it isn't on project file exported from pythonista. Where can I find it? Many thanks

Hello, I would ask if new packages installed with Pypi will be exported to xcodeproject for ios app final build to appstore. Thanks.

Hello to all Pythonista's friends. I've found on Imagemagick website precompiled libraries for ios (libmagickcore and libmagickwand + libjpeg libpng and libtiff). I ask if is possible interact with this library directly from pythonista script, at this link there is an example in objc https://github.com/ZachOrr/Gif-ImageMagick-Example/tree/master/GifExample. Many thanks.