#+begin_src python<div>def add(a,b):</div><div>   return a+b</div><div>def sub(a,b):</div><div>   return a-b</div><div>#+end_src</div><div><br></div><div>Fails to execute due to &#39;unexpected indentation&#39; in general, this is a problem for copy/pasting into any emacs python shell, it wont work. </div>