Quick code review changes to clean up empty files and move functions

apps/openassessment/xblock/assessment_mixin.py

-from django.template import Context
-from django.template.loader import get_template
-from webob import Response
-
-
-class AssessmentMixin(object):
-
-    def render(self, path, context_dict=None):
-        """Render an Assessment Module's HTML
-
-        Given the name of an assessment module, find it in the list of
-        configured modules, and ask for its rendered HTML.
-
-        """
-        if not context_dict: context_dict = {}
-        context_dict["xblock_trace"] = self.get_xblock_trace()
-        context_dict["rubric_instructions"] = self.rubric_instructions
-        context_dict["rubric_criteria"] = self.rubric_criteria
-
-        template = get_template(path)
-        context = Context(context_dict)
-        return Response(template.render(context), content_type='application/html', charset='UTF-8')

apps/openassessment/xblock/grade_mixin.py

-__author__ = 'stephensanchez'

apps/openassessment/xblock/openassessmentblock.py

 """An XBlock where students can read a question and compose their response"""
 
 import datetime
+import pkg_resources
 
 from django.template.context import Context
 from django.template.loader import get_template
-import pkg_resources
+from webob import Response
 
 from xblock.core import XBlock
 from xblock.fields import List, Scope, String
@@ -272,3 +273,22 @@ class OpenAssessmentBlock(XBlock, SubmissionMixin, PeerAssessmentMixin, SelfAsse
             "message": "You have not started this problem",
         }
         return grade_state
+
+    def render(self, path, context_dict=None):
+        """Render an Assessment Module's HTML
+
+        Given the name of an assessment module, find it in the list of
+        configured modules, and ask for its rendered HTML.
+
+        """
+        if not context_dict:
+            context_dict = {}
+
+        # TODO: these shouldn't overwrite
+        context_dict["xblock_trace"] = self.get_xblock_trace()
+        context_dict["rubric_instructions"] = self.rubric_instructions
+        context_dict["rubric_criteria"] = self.rubric_criteria
+
+        template = get_template(path)
+        context = Context(context_dict)
+        return Response(template.render(context), content_type='application/html', charset='UTF-8')

apps/openassessment/xblock/peer_assessment_mixin.py

 from xblock.core import XBlock
 from openassessment.peer import api as peer_api
 from openassessment.peer.api import PeerAssessmentWorkflowError
-from openassessment.xblock.assessment_mixin import AssessmentMixin
 
 
-class PeerAssessmentMixin(AssessmentMixin):
+class PeerAssessmentMixin(object):
 
     @XBlock.json_handler
     def assess(self, data, suffix=''):
@@ -25,6 +24,7 @@ class PeerAssessmentMixin(AssessmentMixin):
                 assessment_dict
             )
 
+
             # Temp kludge until we fix JSON serialization for datetime
             assessment["scored_at"] = str(assessment["scored_at"])
 
@@ -37,9 +37,7 @@ class PeerAssessmentMixin(AssessmentMixin):
                 self.get_student_item_dict(),
                 assessment
             )}
-        return super(PeerAssessmentMixin, self).render(
-            'static/html/oa_peer_assessment.html',
-            context_dict)
+        return self.render('static/html/oa_peer_assessment.html', context_dict)
 
     def get_peer_submission(self, student_item_dict, assessment):
         peer_submission = False
@@ -63,4 +61,4 @@ class PeerAssessmentMixin(AssessmentMixin):
         """
         for assessment in self.rubric_assessments:
             if assessment.name == mixin_name:
-                return assessment
+                return assessment
\ No newline at end of file

apps/openassessment/xblock/self_assessment_mixin.py

 from xblock.core import XBlock
-from openassessment.xblock.assessment_mixin import AssessmentMixin
 
 
-class SelfAssessmentMixin(AssessmentMixin):
+class SelfAssessmentMixin(object):
 
     @XBlock.handler
     def render_self_assessment(self, data, suffix=''):

apps/openassessment/xblock/submission_mixin.py

@@ -40,4 +40,4 @@ class SubmissionMixin(AssessmentMixin):
 
     @XBlock.handler
     def render_submission(self, data, suffix=''):
-        return super(SubmissionMixin, self).render('static/html/oa_response.html')
+        return self.render('static/html/oa_response.html')