code: def set_jobs(self, jobs):
          
          if jobs == "sys":
              self.jobs = None
          else:
              try:
                  jobs = int(jobs)
              except ValueError:
                  jobs = -1  # will raise error below
              if jobs < 0:
                  raise CoconutException("--jobs must be an integer >= 0 or 'sys'")
              self.jobs = jobs
docs: Set --jobs.