hello, This python block:
#+BEGIN_SRC python :session true :results output import numpy as np from ase import Atoms from ase.calculators.gulp import GULP, Conditions quartz = Atoms(symbols='Si3O6', pbc=np.array([True,True,True], dtype=bool), cell=np.array([[4.916, 0.0, 0.0], [-2.4579999999999993, 4.257380885004301, 0.0], [0.0, 0.0, 5.4054]]), positions=np.array([[ 2.3016712, 0., 1.80161982], [-1.1508356, 1.99330573, 3.60341982], [ 1.3071644, 2.26407515, 5.40521982], [ 1.3767258, 1.13288905, 1.15189074], [ 3.2465264, 0.62583499, 2.95369074], [ 2.7507478, 2.49865684, 4.75549074], [ 0.2927478, 1.75872404, 4.25350926], [-1.0812742, 3.12449183, 2.45170926], [ 0.7885264, 3.63154589, 0.64990926]])) #+END_SRC produces this output: #+RESULTS: #+begin_example Python 2.7.13 (default, Jul 2 2017, 01:20:25) [GCC 4.2.1 Compatible FreeBSD Clang 3.4.1 (tags/RELEASE_34/dot1-final 208032)] on freebsd10 Type "help", "copyright", "credits" or "license" for more information. python.el: native completion setup loaded and as assert break class continue def del elif else ....[SNIPPED].... AttributeError OverflowError 0__dummy_completion__ 1__dummy_completion__ #+end_example The same python script produces no errors in a python interpreter started from the command line and it reports no errors when run as 'python twaddle.py'. Any help in debugging this will be much appreciated. Roger Org mode version 9.0.3 (release_9.0.3-170-gfed1cf @ /home/rmason/.emacs.d/org-git/org-mode/lisp/) GNU Emacs 25.2.1 (i386-portbld-freebsd10.3, GTK+ Version 3.22.15) of 2017-07-03 Python 2.7.13 (default, Jul 2 2017, 01:20:25) [GCC 4.2.1 Compatible FreeBSD Clang 3.4.1 (tags/RELEASE_34/dot1-final 208032)] on freebsd10