def getThreadPool(self):
            """
            See L{twisted.internet.interfaces.IReactorThreads.getThreadPool}.
            """
            if self.threadpool is None:
                self._initThreadPool()
            return self.threadpool

            See L{twisted.internet.interfaces.IReactorThreads.getThreadPool}.
            
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/base.py