Hi Dan,
Thank you for the solution and specially for the explanation. The
real problem was not understanding what was wrong. But with the
explanation in the other thread (that you also added in worg) thinks
make sense now.
- Darlan
At Wed, 11 Nov 2009 19:44:34 -0500,
Dan Davison davi...@stats.ox.ac.uk wrote:
Darlan Cavalcante Moreira darc...@gmail.com writes:
Hello org-users,
Today I was bitten by a weird behavior when executing some python
blocks with org-babel that really confused me, but after some trying
and error I was able to isolate the problem.
When a block has an import statement such as
,
| from some_module import *
`
it works with :results output, but not with :results value.
Hi Darlan,
Thanks for your helpful observations in this thread and the other
one. I'm fairly happy with the solution we've arrived at, but the
example you give above actually still won't work in :result value
non-session. The reason is that in that scenario (and only that one), in
order to compute the value of the block, org-babel wraps the code in a
function and evaluates that function.
So the rules are now: in ':results value' non-session mode, you have to
write code that is valid inside a function, and it seems that in python
that is not true for
from some_module import *
I only learned this when studying your post. It seems that it's just the
import * which is a problem; explicitly importing individual components
or named modules is fine. So unless anyone knows better, I guess the
answer is, Don't Do That :)
There's a working version of your example below that avoids import *,
with the new necessary 'return' statements added.
Dan
* dc
#+begin_src python :tangle test :results silent
def double_input(a):
return a*2
#+end_src
#+begin_src python :results value
import test
def times_four(a):
return test.double_input(a)*2
if __name__ == '__main__':
print Value is %s % times_four(10)
return times_four(10)
#+end_src
#+resname:
: 40
#+begin_src python :results value
from test import double_input
def times_four(a):
return double_input(a)*2
if __name__ == '__main__':
print Value is %s % times_four(10)
return times_four(10)
#+end_src
#+resname:
: 40
The content of simple file to reproduce the problem is showed below
--- Cut here ---
* Test Org-babel
#+begin_src python :tangle test :results silent
def double_input(a):
return a*2
#+end_src
#+begin_src python :results value
import test
def times_four(a):
return test.double_input(a)*2
if __name__ == '__main__':
print Value is %s % times_four(10)
times_four(10)
#+end_src
#+begin_src python :results value
from test import *
def times_four(a):
return double_input(a)*2
if __name__ == '__main__':
print Value is %s % times_four(10)
times_four(10)
#+end_src
--- End of cut -
To reproduce the problem, tangle the file to create test.py from the
first block. Then executing the second block (which has no import *)
works with either :results output or :results value.
However, the third block, (which uses import *) only works if executed
with :results output. I can't see the reason for this since the code
is right and works in a python buffer as expected.
- Darlan
___
Emacs-orgmode mailing list
Remember: use `Reply All' to send replies to the list.
Emacs-orgmode@gnu.org
http://lists.gnu.org/mailman/listinfo/emacs-orgmode
___
Emacs-orgmode mailing list
Remember: use `Reply All' to send replies to the list.
Emacs-orgmode@gnu.org
http://lists.gnu.org/mailman/listinfo/emacs-orgmode
