Hi,
     I try to understand the difference of "session" and "non-session" as
in
 http://orgmode.org/manual/Results-of-evaluation.html#Results-of-evaluation
<http://orgmode.org/manual/Results-of-evaluation.html#Results-of-evaluation>

However, I copy-paste the example but have different result. It looks like
that the result contains whatever sent to the interactive shell too. Any
option I need to set to reproduce the same result as in the manual?  I am
using python 2.7.5 + emacs 24.3.9 + orgmode 8.2.6.

#+BEGIN_SRC python :results output :session
 print "hello"
 2
 print "bye"
#+END_SRC

#+RESULTS:
: print "hello"
: hello
: 2
: 2
: print "bye"
: bye
:
: