def sumNumbers(self, root):
        result = []
        self.dfs(root, "", result)
        result = [int(element) for element in result]
        return sum(result)
Install the signal handlers for the Twisted event loop.
dataset/ETHPy150Open algorhythms/LeetCode/129 Sum Root to Leaf Numbers.py/Solution.sumNumbers--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/internet/base.py/_SignalReactorMixin._handleSignals