def get_argument(self, name):
        val = self.arguments.get(name)
        if val:
            return val[0]
        return None
Error is raised if the given event is not registered.
dataset/ETHPy150Open mrjoes/tornadio2/tornadio2/session.py/ConnectionInfo.get_argument--crossover with--dataset/ETHPy150Open F-Secure/see/see/test/environment_test.py/EnvironmentTest.test_unsubscribe_no_such_event