def run_stddev_tests():
    if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'] == 'django.db.backends.sqlite3':
        return False

    class StdDevPop(object):
        sql_function = 'STDDEV_POP'

    try:
        connection.ops.check_aggregate_support(StdDevPop())
    except:
        return False
    return True
Check to see if StdDev/Variance tests should be run.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/tests/regressiontests/aggregation_regress/tests.py/run_stddev_tests