Disable flake8 test in python3 since 2to3 often breaks the format.

theano/tests/test_flake8.py

@@ -6,6 +6,7 @@ from nose.plugins.skip import SkipTest
 import os
 from fnmatch import fnmatch
 import theano
+from theano.compat import PY3
 try:
     import flake8.engine
     import flake8.main
@@ -346,6 +347,8 @@ def test_format_flake8():
     """
     if not flake8_available:
         raise SkipTest("flake8 is not installed")
+    if PY3:
+        raise SkipTest("not testing in python3 since 2to3 ran")
     total_errors = 0
     for path in list_files():
         rel_path = os.path.relpath(path, theano.__path__[0])