response = client.get_object(
            Bucket=bucketName,
    Key=filename,
)

{u'Body': <botocore>, u'AcceptRanges': 'bytes', u'ContentType': 'binary/octet-stream', 'ResponseMetadata': {'HTTPStatusCode': 200, 'RetryAttempts': 0, 'HostId': 'kzPynXiR9Y9p6Io1wetoU0h5MHoCUnyLOozYklHUtmCoVIkRInBTFmDdPTTQL5M+uPxO9LZg/Cc=', 'RequestId': '918A5DC46DB1D730', 'HTTPHeaders': {'content-length': '230461427', 'x-amz-id-2': 'kzPynXiR9Y9p6Io1wetoU0h5MHoCUnyLOozYklHUtmCoVIkRInBTFmDdPTTQL5M+uPxO9LZg/Cc=', 'accept-ranges': 'bytes', 'server': 'AmazonS3', 'last-modified': 'Tue, 31 Jul 2018 04:19:33 GMT', 'x-amz-request-id': '918A5DC46DB1D730', 'etag': '"cf830c9fdf2717fbb9d189bcc8afd3ee-28"', 'date': 'Tue, 31 Jul 2018 05:02:55 GMT', 'content-type': 'binary/octet-stream'}}, u'LastModified': datetime.datetime(2018, 7, 31, 4, 19, 33, tzinfo=tzutc()), u'ContentLength': 230461427, u'ETag': '"cf830c9fdf2717fbb9d189bcc8afd3ee-28"', u'Metadata': {}}