When I tried to build the example PythonistaProject in XCode 6, I get the following error:

Undefined symbols for architecture i386:
  "_fwrite$UNIX2003", referenced from:
  _empty_output_buffer in libpythonista.a(libturbojpeg_la-jdatadst.o)
  _term_destination in libpythonista.a(libturbojpeg_la-jdatadst.o)
  "_putenv$UNIX2003", referenced from:
  _tjTransform in libpythonista.a(libturbojpeg_la-turbojpeg.o)
  _tjDecompressToYUV in libpythonista.a(libturbojpeg_la-turbojpeg.o)
  _tjDecompress2 in libpythonista.a(libturbojpeg_la-turbojpeg.o)
  _tjEncodeYUV2 in libpythonista.a(libturbojpeg_la-turbojpeg.o)
  _tjCompress2 in libpythonista.a(libturbojpeg_la-turbojpeg.o)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Does anybody know how to deal with this?

I got that error using XCode 6.1

The pic2shop trick works but if you want to create a standalone app, that's not an option.

I hope a built-in integration of barcode and QR code scanning (with zbar) in Pythonista will come soon. I am working on a bitcoin wallet app, which requires QR scanning. It would be nice indeed if we would just import zbar and do everything in Python.

It seems that iOS 7 even has built-in support for QR code scanning according to this article: http://www.appcoda.com/qr-code-ios-programming-tutorial/