'Return the locator string for the course.'

@property
def _course_location(self):

    course_key = CourseKey.from_string(self._course_key)
    if getattr(course_key, 'deprecated', False):
        block_id = self._course_dict['run']
    else:
        block_id = 'course'
    return unicode(course_key.make_usage_key('course', block_id))
