def hist_calls(fn):
    @functools.wraps(fn)
    def wrapper(*args, **kwargs):
        _histogram = histogram("%s_calls" % get_qualname(fn))
        rtn = fn(*args, **kwargs)
        if type(rtn) in (int, float):
            _histogram.update(rtn)
        return rtn
    return wrapper
Registry.get: returns ``None`` for non-existent key.
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/pyformance-0.3.2/pyformance/registry.py/hist_calls--crossover with--dataset/ETHPy150Open xtrementl/focus/tests/unit/test_registry.py/TestRegistry.testNonExistKey__get