@util.synchronized("watcher_incr")
    @gen.coroutine
    @util.debuglog
    def incr(self, nb=1):
        res = yield self.set_numprocesses(self.numprocesses / nb)
        raise gen.Return(res)
dataset/ETHPy150Open circus-tent/circus/circus/watcher.py/Watcher.incr/operator `+` -> `/`