download_s3_files.py

import os
from boto.s3.connection import S3Connection


def main():

    backup_folder = "<your_path>"
    access_key = "<s3_access_key>"
    secret_key = "<s3_secret_key>"
    bucket_name = "<s3_bucket_name>"

    amazon_s3 = S3Connection(access_key, secret_key)
    bucket = amazon_s3.get_bucket(bucket_name)
    # For every file
    for key in bucket.list():
        backup_file_path = os.path.join(backup_folder, bucket_name, key.name)
        print(backup_file_path)
        parent_folder = os.path.dirname(backup_file_path)
        # Create parent folder if missing
        if not os.path.exists(parent_folder):
            os.makedirs(parent_folder)
        # Skip if it's already there
        if not os.path.isfile(backup_file_path):
            key.get_contents_to_filename(backup_file_path)


if __name__ == '__main__':
    main()