How to use the msrestazure.azure_cloud function in msrestazure

raw_cloud_env = self.credentials.get('cloud_environment')
        if not raw_cloud_env:
            self._cloud_environment = azure_cloud.AZURE_PUBLIC_CLOUD  # SDK default
        else:
            # try to look up "well-known" values via the name attribute on azure_cloud members
            all_clouds = [x[1] for x in inspect.getmembers(azure_cloud) if isinstance(x[1], azure_cloud.Cloud)]
            matched_clouds = [x for x in all_clouds if x.name == raw_cloud_env]
            if len(matched_clouds) == 1:
                self._cloud_environment = matched_clouds[0]
            elif len(matched_clouds) > 1:
                self.fail("Azure SDK failure: more than one cloud matched for cloud_environment name '{0}'".format(raw_cloud_env))
            else:
                if not urlparse.urlparse(raw_cloud_env).scheme:
                    self.fail("cloud_environment must be an endpoint discovery URL or one of {0}".format([x.name for x in all_clouds]))
                try:
                    self._cloud_environment = azure_cloud.get_cloud_from_metadata_endpoint(raw_cloud_env)
                except Exception as e:
                    self.fail("cloud_environment {0} could not be resolved: {1}".format(raw_cloud_env, e.message))

        if self.credentials.get('subscription_id', None) is None:
            self.fail("Credentials did not include a subscription_id value.")
        self.log("setting subscription_id")
        self.subscription_id = self.credentials['subscription_id']

        # get authentication authority
        # for adfs, user could pass in authority or not.
        # for others, use default authority from cloud environment
        if self.credentials.get('adfs_authority_url'):
            self._adfs_authority_url = self.credentials.get('adfs_authority_url')
        else:
            self._adfs_authority_url = self._cloud_environment.endpoints.active_directory