def remove_custom_variable(self, index):
        if index in self.custom_variables:
            del self.custom_variables[index]
Test to ensure modifying the output argument has the desired effect
dataset/ETHPy150Open kra3/py-ga-mob/pyga/requests.py/Tracker.remove_custom_variable--crossover with--dataset/ETHPy150Open timothycrosley/hug/tests/test_routing.py/TestRouter.test_output