from s3fs.core import S3FileSystem

client_kwargs={"aws_access_key_id": "blah", "aws_secret_access_key": "blah2"}
conn = S3FileSystem(client_kwargs=client_kwargs)
conn.exists(path="my_path")

botocore.exceptions.ClientError: An error occurred (AccessDenied) when calling the ListObjectsV2 operation: Access Denied

{
    "Id": "Policy1566429314117",
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Stmt1566429308194",
            "Action": [
                "s3:ListBucket"
            ],
            "Effect": "Allow",
            "Resource": "arn:aws:s3:::myBucket",
            "Principal": {
                "AWS": [
                    "arn:aws:iam::111549047503:user/myUser"
                ]
            }
        }
    ]
}

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Stmt1566429639314",
            "Action": [
                "s3:ListBucket"
            ],
            "Effect": "Allow",
            "Resource": "arn:aws:s3:::myBucket"
        }
    ]
}