code: def returncode(self):
          '''
          Runs the command if it has not yet run (redirecting output to stdout).
          :return: The returncode of the last executed command in the chain.
          '''
          if not self._pop:
              self > sys.stdout
          link = self
          while link is not None:
              if link._pop:
                  return link._pop.returncode
          return Nonf returncode(self):
          '''
          Runs the command if it has not yet run (redirecting output to stdout).
          :return: The returncode of the last executed command in the chain.
          '''
          if not self._pop:
              self > sys.stdout
          link = self
          while link is not None:
              if link._pop:
                  return link._pop.returncode
          return None
docs: Runs the command if it has not yet run (redirecting output to stdout).
          :return: The returncode of the last executed command in the chain.