def get_dir_from_zipfile(zip_file, fallback=None):
    """Return the name of the root folder in a zip file.

    :param zip_file: a :class:`zipfile.ZipFile` instance.
    :param fallback: if `None`, the name of the zip file is used. This is
        returned if the zip file contains more than one top-level directory,
        or none at all.
    """
    fallback = fallback or zip_file.filename
    directories = [name for name in zip_file.namelist() if name.endswith("/")
                   and len(PurePath(name).parts) == 1]
    return fallback if len(directories) > 1 else directories[0]
def __init__(
        self,
        credential: "AsyncTokenCredential",
        subscription_id: str,
        base_url: str = "https://management.azure.com",
        **kwargs: Any
    ) -> None:
        self._config = SqlVirtualMachineManagementClientConfiguration(credential=credential, subscription_id=subscription_id, **kwargs)
        self._client = AsyncARMPipelineClient(base_url=base_url, config=self._config, **kwargs)

        client_models = {k: v for k, v in models.__dict__.items() if isinstance(v, type)}
        self._serialize = Serializer(client_models)
        self._deserialize = Deserializer(client_models)
        self._serialize.client_side_validation = False
        self.availability_group_listeners = AvailabilityGroupListenersOperations(self._client, self._config, self._serialize, self._deserialize)
        self.operations = Operations(self._client, self._config, self._serialize, self._deserialize)
        self.sql_virtual_machine_groups = SqlVirtualMachineGroupsOperations(self._client, self._config, self._serialize, self._deserialize)
        self.sql_virtual_machines = SqlVirtualMachinesOperations(self._client, self._config, self._serialize, self._deserialize)