How to use the azure-mgmt-servermanager.azure.mgmt.servermanager.models.__dict__ function in azure-mgmt-servermanager

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

        self.config = ServerManagementConfiguration(credentials, subscription_id, base_url)
        super(ServerManagement, self).__init__(self.config.credentials, self.config)

        client_models = {k: v for k, v in models.__dict__.items() if isinstance(v, type)}
        self.api_version = '2016-07-01-preview'
        self._serialize = Serializer(client_models)
        self._deserialize = Deserializer(client_models)

        self.gateway = GatewayOperations(
            self._client, self.config, self._serialize, self._deserialize)
        self.node = NodeOperations(
            self._client, self.config, self._serialize, self._deserialize)
        self.session = SessionOperations(
            self._client, self.config, self._serialize, self._deserialize)
        self.power_shell = PowerShellOperations(
            self._client, self.config, self._serialize, self._deserialize)