code: def tokens(self):
          
          if self._tokens is None:
              self._tokens = TokenList(self._version, account_sid=self._solution['sid'], )
          return self._tokens
docs: Access the tokens
  
          :returns: twilio.rest.api.v2010.account.token.TokenList
          :rtype: twilio.rest.api.v2010.account.token.TokenList