code: def get_envs(self, log=True):
          
          if log:
              logger.debug('')
  #        return self._call_and_parse(['info', '--json'],
  #                                    callback=lambda o, e: o['envs'])
          envs = os.listdir(os.sep.join([self.ROOT_PREFIX, 'envs']))
          envs = [os.sep.join([self.ROOT_PREFIX, 'envs', i]) for i in envs]
  
          valid_envs = [e for e in envs if os.path.isdir(e) and
                        self.environment_exists(prefix=e)]
  
          return valid_envs
docs: Return environment list of absolute path to their prefixes.