def s3_download(s3_bucket, file_key, output_path):
    
    """Download a file from S3."""
    
    print(f"downloading [{file_key}] from [{s3_bucket.name}] to [{output_path.resolve().as_posix()}]")
    s3_bucket.download_file(file_key, output_path.resolve().as_posix())
    
    return output_path