def fetch(self):
        """
        Fetch a VariableInstance

        :returns: Fetched VariableInstance
        :rtype: twilio.rest.serverless.v1.service.environment.variable.VariableInstance
        """
        params = values.of({})

        payload = self._version.fetch(
            'GET',
            self._uri,
            params=params,
        )

        return VariableInstance(
            self._version,
            payload,
            service_sid=self._solution['service_sid'],
            environment_sid=self._solution['environment_sid'],
            sid=self._solution['sid'],
        )
Fetch a VariableInstance

        :returns: Fetched VariableInstance
        :rtype: twilio.rest.serverless.v1.service.environment.variable.VariableInstance