def counter(self, key):
        if key not in self._counters:
            self._counters[key] = Counter()
        return self._counters[key]
On Python 2 :py:class:`Context` accepts values of type
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/pyformance-0.3.2/pyformance/registry.py/MetricsRegistry.counter--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/pyopenssl/OpenSSL/test/test_ssl.py/ContextTests.test_method_long