How to use the azure-mgmt-subscription.azure.mgmt.subscription.version.VERSION function in azure-mgmt-subscription

def __init__(
            self, credentials, base_url=None):

        if credentials is None:
            raise ValueError("Parameter 'credentials' must not be None.")
        if not base_url:
            base_url = 'https://management.azure.com'

        super(SubscriptionClientConfiguration, self).__init__(base_url)

        self.add_user_agent('azure-mgmt-subscription/{}'.format(VERSION))
        self.add_user_agent('Azure-SDK-For-Python')

        self.credentials = credentials