Changing the Python source block to

#+BEGIN_SRC python :output results
def square (x):
    return x*x

print(square(5))
#+END_SRC

didn't change anything here, neither with emacs24 nor with git emacs,
and I grepped (recursively) for ":output" in the directory where I
cloned https://code.orgmode.org/bzg/org-mode.git and only found
references to ":output-dir" - except for a single occurrence of
":output" in contrib/lisp/ob-sclang.el...

Are you sure that you wrote it correctly?

  Cheers, E. =)
  http://angg.twu.net/#eev


On Sun, 10 Nov 2019 at 08:39, Ken Mankoff <mankoff@gmail.com> wrote:

>
> On 2019-11-10 at 02:54 +01, Eduardo Ochs <eduardoochs@gmail.com> wrote...
> > #+BEGIN_SRC python
> > def square (x):
> >     return x*x
> >
> > print(square(5))
> > #+END_SRC
> >
> > [...] when I run the Python block with C-c C-c I always get a results
> > block like this (without the indentation):
> >
> >   #+RESULTS:
> >   : None
> >
> > What am I doing wrong? I expected an output of "25"... =(
>
> Adding ":output results" makes this work for me, but I'm not using emacs24.
>
>   -k.
>