假设我们有这样的工作:classMRjob(JobTask):defoutput(self):return...defrequires(self):return...defmapper(self,line):#somelineprocessyieldkey,(...information,storedinhashabletype...)defreducer(self,key,values):#somereducelogic...forexamplethisunique=set(values)foreleminunique:yieldkey,elem[0],elem[1]我应该在输出方法