code: def op_list_venvs(self):
          
          self.logger.info('Listing known virtual environments ...')
          venvs = self.get_venvs()
          for venv in venvs:
              self.logger.info('Found `%s`' % venv)
          else:
              self.logger.info('No virtual environments found in `%s` directory.' % VENVS_DIRNAME)
          return venvs
docs: Prints out and returns a list of known virtual environments.
  
          :rtype: list
          :return: list of virtual environments