Flake8

theano/gof/tests/test_fg.py

 from __future__ import absolute_import, print_function, division
 import os
 import pickle
-import sys
 import unittest
 
-from nose.plugins.skip import SkipTest
-
 import theano
 from theano.compat import PY3
 from theano.gof import CachedConstantError, FunctionGraph