Changed CourseGrader to be an abstract base class.

f987f99a · Bridger Maxwell · 9ee09ec9 · f987f99a
Commit f987f99a authored Apr 17, 2012 by Bridger Maxwell
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djangoapps/courseware/graders.py
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--- a/djangoapps/courseware/graders.py
+++ b/djangoapps/courseware/graders.py
+import abc
 import logging

 from django.conf import settings
@@ -86,6 +87,10 @@ class CourseGrader(object):
    
    
    """
+    
+    __metaclass__ = abc.ABCMeta
+    
+    @abc.abstractmethod
    def grade(self, grade_sheet):
        raise NotImplementedError