Added missing import for py2exe

opengeode.py

@@ -30,6 +30,7 @@ from itertools import chain
 # Added to please py2exe - NOQA makes flake8 ignore the following lines:
 # pylint: disable=W0611
 import enum  # NOQA
+import operator  # NOQA
 import subprocess  # NOQA
 import distutils  # NOQA
 import tempfile  # NOQA