Hello World issues when using %% with ipython

[landlord1984]

Magic functions Cell magics are prefixed with a double %%, and they are functions that get as an argument not only the rest of the line, but also the lines below it in a separate argument.

So what command do I need to use if I have no argument?

I have tried "%%python","%%python2" and "%%pypy". None of them just works by ENTER.

Thanks,

L