sigv4 multipart upload test script

upload.py

#!/usr/bin/env python

import sys

import boto3
from botocore.client import Config

session = boto3.session.Session()
client = session.client('s3', config=Config(signature_version='s3v4'))

bucket = 'my-bucket'
key = 'test.txt'

upload_data = bytes("Hello world\n")
size = sys.getsizeof(upload_data)

mpu = client.create_multipart_upload(Bucket=bucket,
                                     Key=key)

part1 = client.upload_part(Bucket=bucket,
                           Key=key,
                           Body=upload_data,
                           UploadId=mpu['UploadId'],
                           PartNumber=1,
                           ContentLength=size)

partinfo = {'Parts':[{'ETag': part1['ETag'], 'PartNumber': 1}]}

complete = client.complete_multipart_upload(Bucket=bucket,
                                            Key=key,
                                            MultipartUpload=partinfo,
                                            UploadId=mpu['UploadId'])