How to use the s3contents.ipycompat.HasTraits function in s3contents

"""
Generic FileSystem class to be used by the Content Manager
"""

from s3contents.ipycompat import HasTraits


class GenericFS(HasTraits):
    def ls(self, path=""):
        raise NotImplementedError(
            "Should be implemented by the file system abstraction"
        )

    def isfile(self, path):
        raise NotImplementedError(
            "Should be implemented by the file system abstraction"
        )

    def isdir(self, path):
        raise NotImplementedError(
            "Should be implemented by the file system abstraction"
        )

    def mv(self, old_path, new_path):

"""
Utilities to make S3 look like a regular file system
"""
import six
import boto3
from botocore.client import Config

from s3contents.ipycompat import HasTraits, Unicode


class S3FS(HasTraits):

    access_key_id = Unicode(
        help="S3/AWS access key ID", allow_none=True, default_value=None).tag(
            config=True, env="JPYNB_S3_ACCESS_KEY_ID")
    secret_access_key = Unicode(
        help="S3/AWS secret access key", allow_none=True, default_value=None).tag(
            config=True, env="JPYNB_S3_SECRET_ACCESS_KEY")

    endpoint_url = Unicode(
        "s3.amazonaws.com", help="S3 endpoint URL").tag(
            config=True, env="JPYNB_S3_ENDPOINT_URL")
    region_name = Unicode(
        "us-east-1", help="Region Name").tag(
            config=True, env="JPYNB_S3_REGION_NAME")
    bucket_name = Unicode(
        "notebooks", help="Bucket name to store notebooks").tag(