Lets allow the helpers to be helpfull

I had problems transissioning form python 2 to 3 due to imports failing
when running tests. This shows (what i hope) is the correct way of
dealing with imports.

sample/core.py

 # -*- coding: utf-8 -*-
+from . import helpers
 
 def get_hmm():
     """Get a thought."""
     return 'hmmm...'
 
+
 def hmm():
     """Contemplation..."""
-    print get_hmm()
\ No newline at end of file
+    if helpers.get_answer():
+        print(get_hmm())

sample/helpers.py

+def get_answer():
+    """Get an answer."""
+    return True

tests/test_advanced.py

@@ -9,8 +9,8 @@ class AdvancedTestSuite(unittest.TestCase):
     """Advanced test cases."""
 
     def test_thoughts(self):
-        sample.hmm()
+        self.assertIsNone(sample.hmm())
 
 
 if __name__ == '__main__':
-    unittest.main()
\ No newline at end of file
+    unittest.main()