org-mode babel python session and inlined image incompatible?

Question

If I use this block

#+BEGIN_SRC python :results file
from pylab import *
plot(rand(10))
savefig('images/test.png')
return 'images/test.png'
#+END_SRC

then the RESULTS block shows me an inlined version of the plot.

If now I switch to this block

#+BEGIN_SRC python :session test :results file
from pylab import *
plot(rand(10))
savefig('images/test.png')
return 'images/test.png'
#+END_SRC

then the RESULTS block does not show the inlined plot but this

| <matplotlib.lines.Line2D | object | at | 0x35c0650> |

Using a session is kind of mandatory for me because I need several blocks to share variables.

Is there something evidently wrong with my approach?

user594138 · Accepted Answer · 2013-05-06 11:14:21Z

2

As per the org-mode documentation, you have to drop the return if the code is running in a session.

#+BEGIN_SRC python :session test :results file
  from pylab import *
  plot(rand(10))
  savefig('images/test.png')
  'images/test.png'
#+END_SRC 

#+RESULTS:
[[file:images/test.png]]

because "the result returned is the result of the last evaluation performed by the interpreter."

answered May 6, 2013 at 11:14

user594138

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