docs: def set_root_prefix(self, prefix=None):
          """
          Set the prefix to the root environment (default is /opt/anaconda).
  
          This function should only be called once (right after importing
          conda_api).
          """
          if prefix:
              self.ROOT_PREFIX = prefix
          else:
              # Find some conda instance, and then use info to get 'root_prefix'
              worker = self._call_and_parse(['info', '--json'], abspath=False)
              info = worker.communicate()[0]
              self.ROOT_PREFIX = info['root_prefix']