'Returns a list of all applicable column headers for this grade report.'

def _success_headers(self, context):

    return (((((((['Student    ID', 'Email', 'Username', 'Grade'] + self._grades_header(context)) + (['Cohort    Name'] if context.cohorts_enabled else [])) + [u'Experiment    Group    ({})'.format(partition.name) for partition in context.course_experiments]) + (['Team    Name'] if context.teams_enabled else [])) + ['Enrollment    Track', 'Verification    Status']) + ['Certificate    Eligible', 'Certificate    Delivered', 'Certificate    Type']) + ['Enrollment    Status'])
