code: def removeJob(self, jobBatchSystemID):
          
          assert jobBatchSystemID in self.jobBatchSystemIDToIssuedJob
          jobNode = self.jobBatchSystemIDToIssuedJob[jobBatchSystemID]
          if jobNode.preemptable:
              # len(jobBatchSystemIDToIssuedJob) should always be greater than or equal to preemptableJobsIssued,
              # so decrement this value before removing the job from the issuedJob map
              assert self.preemptableJobsIssued > 0
              self.preemptableJobsIssued -= 1
          del self.jobBatchSystemIDToIssuedJob[jobBatchSystemID]
          # If service job
          if jobNode.jobStoreID in self.toilState.serviceJobStoreIDToPredecessorJob:
              # Decrement the number of services
              if jobNode.preemptable:
                  self.preemptableServiceJobsIssued -= 1
              else:
                  self.serviceJobsIssued -= 1
  
          return jobNode
docs: Removes a job from the system.