Skip a test with python 2.6

theano/gof/tests/test_fg.py

 import os
 import pickle
+import sys
 import unittest
 
+from nose.plugins.skip import SkipTest
+
 import theano
 from theano.compat.six import PY3
 from theano.gof import CachedConstantError, FunctionGraph
@@ -34,6 +37,8 @@ class TFunctionGraph(unittest.TestCase):
 
         This test run the pickle that reproduce this case.
         """
+        if sys.version_info[:2] < (2, 7):
+            raise SkipTest("This test need python 2.7 or more recent.")
         with open(os.path.join(os.path.dirname(__file__),
                                'test_fg_old_crash.pkl'),
                   'rb') as f: