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[O] odd/unexpected behavior with Python src blocks
From: |
John Kitchin |
Subject: |
[O] odd/unexpected behavior with Python src blocks |
Date: |
Sun, 28 Sep 2014 18:11:46 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (darwin) |
* Odd behavior in python src-blocks in org-mode
I found that some code blocks in Python execute due to apparently silent
errors! here is how to reproduce it with a vanilla emacs -q.
#+BEGIN_SRC emacs-lisp
(org-babel-do-load-languages
'org-babel-load-languages
'((emacs-lisp . t)
(python . t)))
(setq org-confirm-babel-evaluate nil)
#+END_SRC
#+RESULTS:
This block should raise an error (and does) because k is not defined.
#+BEGIN_SRC python
def f(y, x):
return k * y
print(f(1, 0))
#+END_SRC
#+RESULTS:
It raises this error.
#+BEGIN_EXAMPLE
Traceback (most recent call last):
File "<stdin>", line 4, in <module>
File "<stdin>", line 2, in f
NameError: global name 'k' is not defined
#+END_EXAMPLE
However, this code block actually executes, and gives the wrong answer! If I
open the source block in Python mode, it does not run without error.
#+BEGIN_SRC python :results output
from scipy.integrate import odeint
def f(y, x):
return k * y
print(odeint(f, 1, [0, 1]))
#+END_SRC
#+RESULTS:
: [[ 1.]
: [ 1.]]
Here is the correct answer.
#+BEGIN_SRC python :results output
from scipy.integrate import odeint
k = -1
def f(y, x):
return k * y
print(odeint(f, 1, [0, 1]))
#+END_SRC
#+RESULTS:
: [[ 1. ]
: [ 0.36787947]]
I am not sure why this happens, but it seems like incorrect behavior to
me.
--
-----------------------------------
John Kitchin
http://kitchingroup.cheme.cmu.edu
- [O] odd/unexpected behavior with Python src blocks,
John Kitchin <=