How to use the s3contents.genericfs.GenericFS function in s3contents

import os

import gcsfs

from s3contents.genericfs import GenericFS, NoSuchFile
from s3contents.ipycompat import Unicode


class GCSFS(GenericFS):

    project = Unicode(help="GCP Project", allow_none=True, default_value=None).tag(
        config=True, env="JPYNB_GCS_PROJECT"
    )
    token = Unicode(
        help="Path to the GCP token", allow_none=True, default_value=None
    ).tag(config=True, env="JPYNB_GCS_TOKEN_PATH")

    region_name = Unicode("us-east-1", help="Region name").tag(
        config=True, env="JPYNB_GCS_REGION_NAME"
    )
    bucket = Unicode("notebooks", help="Bucket name to store notebooks").tag(
        config=True, env="JPYNB_GCS_BUCKET"
    )

    prefix = Unicode("", help="Prefix path inside the specified bucket").tag(

SAMPLE_ACCESS_POLICY = """
{{
    "Sid": "S3contentsKeepFile",
    "Action": [
        "s3:*"
    ],
    "Effect": "Allow",
    "Resource": [
        "arn:aws:s3:::{bucket}/.s3keep"
    ]
}}
"""


class S3FS(GenericFS):

    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 = Unicode("notebooks", help="Bucket name to store notebooks").tag(
        config=True, env="JPYNB_S3_BUCKET"