How to get access to aws s3 calling the ListObjectsV2 operation in Python script

Question

Hi Guys,I try to get data from S3 AWS bucket. I set up bucket like public with bucket policy:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "PublicRead",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "*",
            "Resource": "arn:aws:s3:::transformed-for-visualization-data-1/*"
        }
    ]
}

In python script :

import boto3
from botocore import UNSIGNED
from botocore.client import Config

client = boto3.client('s3', config=Config(signature_version=UNSIGNED))
resource = boto3.client('s3', config=Config(signature_version=UNSIGNED))

for obj in client.list_objects_v2(Bucket='transformed-for-visualization-data-1', Prefix="csv/")['Contents']:
    print(obj['Key'])

after run it got an error:

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

Where is mistake ?