It's a bit confusing because parts of IPython became Jupyter. But since they split, IPython is two things: the Python kernel for Jupyter, and a terminal interf

It's a bit confusing because parts of IPython became Jupyter. But since they split, IPython is two things: the Python kernel for Jupyter, and a terminal interface that uses the same core execution machinery within the process. So it will only be possible to run Python 3 code in IPython 6, but it will still be possible to use IPython 5 as a kernel for future versions of Jupyter.