[gentoo-user] IPython with Python3 - what magic am I missing?

[Helmut Jarausch]

Hi,

I'd like start IPython with Python3 as underlying Python interpretor.
GenToo has some magic to invoke IPython which I don't understand.

/usr/bin/ipython is a symlink to /usr/bin/python-exec which is a script
invoking the binary /usr/bin/python-exec-c

I don't have Python3 as standard Python version (too dangerous with  
Portage?)

How can I convince IPython to use Python3?

I've tried
python3 /usr/lib64/python3.3/site-packages/spyderlib/widgets/ipython.py
but hits just quits without any visible action.

Many thanks for a hint,
Helmut