def __init__(self, callback):
        super(CallbackGauge, self).__init__()
        self.callback = callback
This used to generate a server 500:
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/pyformance-0.3.2/pyformance/meters/gauge.py/CallbackGauge.__init__--crossover with--dataset/ETHPy150Open pennersr/django-allauth/allauth/socialaccount/providers/openid/tests.py/OpenIDTests.test_discovery_failure