code: def put(self, job, result):
          "Perform a job by a member in the pool and return the result."
          self.job.put(job)
          r = result.get()
          return f put(self, job, result):
          "Perform a job by a member in the pool and return the result."
          self.job.put(job)
          r = result.get()
          return r
docs: Perform a job by a member in the pool and return the result.