Fixes.

common/lib/xmodule/xmodule/lti_module.py

@@ -214,7 +214,7 @@ class LTIModule(LTIFields, XModule):
         # This is needed for body encoding:
         headers = {'Content-Type': 'application/x-www-form-urlencoded'}
 
-        _, headers, _ = client.sign(
+        __, headers, __ = client.sign(
             unicode(self.launch_url),
             http_method=u'POST',
             body=body,

lms/djangoapps/courseware/tests/test_lti.py

@@ -49,7 +49,7 @@ class TestLTI(BaseTestXmodule):
             Mocked oauth1 sign function.
             """
             # self is <oauthlib.oauth1.rfc5849.Client object> here:
-            _, headers, _ = saved_sign(self, *args, **kwargs)
+            __, headers, __ = saved_sign(self, *args, **kwargs)
             # we should replace noonce, timestamp and signed_signature in headers:
             old = headers[u'Authorization']
             old_parsed = OrderedDict([param.strip().replace('"', '').split('=') for param in old.split(',')])