import boto3
import os
from pathlib import Path

session = boto3.Session(
    aws_access_key_id='AK...',
    aws_secret_access_key='SK...'
#     region = 'us-east-1'
)

s3_resource = session.resource('s3')
bucket = s3.Bucket('bucket-name')
key = 'prefix-name'
objs = list(bucket.objects.filter(Prefix=key))

for obj in objs:
    # print(obj.key)
    # remove the file name from the object key
    obj_path = os.path.dirname(obj.key)

    # create nested directory structure
    Path(obj_path).mkdir(parents=True, exist_ok=True)

    # save file with full path locally
    bucket.download_file(obj.key, obj.key)