** comparative speed of python evaluation
   :PROPERTIES:
   :DATE:     2010-09-07
   :END:
#+begin_src python :session test
  2+2
#+end_src

#+name:
: 4

#+begin_src python
  return 2+2
#+end_src

#+name:
: 4

#+begin_src python :session test
def add(a,b):
   return a+b
def sub(a,b):
   return a-b
add(sub(10,1),sub(10,2))
#+end_src

#+name:
: org_babel_python_eoe