completing multipart upload

I’m having trouble with completing a multipart upload

given the following test code

mp = s.create_multipart_upload(Bucket='datalake.primary', Key='test1')
uid = mp['UploadId']
p1 =s.upload_part(Bucket='datalake.primary', Key='test1', PartNumber=1, UploadId=uid, Body='part_0')
s.complete_multipart_upload(Bucket='datalake.primary', Key='test1', UploadId=uid, MultipartUpload=???)

I don’t know what I’m supposed to be setting MultipartUpload to and can’t work it out in the docs. I see it needs to be a dict but not sure what it should contain.

Without it, I get the error ClientError: An error occurred (InvalidRequest) when calling the CompleteMultipartUpload operation: You must specify at least one part

[danielgtaylor]

@owenrumney this is really not obvious from the documentation, so it took me a few tries to get right. Multipart uploads require information about each part when you try to complete the upload. This is how you can accomplish it:

import boto3

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

s3 = boto3.client('s3')

# Initiate the multipart upload and send the part(s)
mpu = s3.create_multipart_upload(Bucket=bucket, Key=key)
part1 = s3.upload_part(Bucket=bucket, Key=key, PartNumber=1,
                       UploadId=mpu['UploadId'], Body='Hello, world!')

# Next, we need to gather information about each part to complete
# the upload. Needed are the part number and ETag.
part_info = {
    'Parts': [
        {
            'PartNumber': 1,
            'ETag': part['ETag']
        }
    ]
}

# Now the upload works!
s3.complete_multipart_upload(Bucket=bucket, Key=key, UploadId=mpu['UploadId'],
                             MultipartUpload=part_info)

I’ll see what can be done about updating the documentation upstream. Let me know if you have any other questions!

Also, you can enable low-level logging at any time with this:

boto3.set_stream_logger(name='botocore')

[a523]

Is the “ MultipartUpload” REQUIRED?
I can’t find the “REQUIRED” behind the arg “MultipartUpload” from the docs of boto3 ,but i code

rep = s3.complete_multipart_upload(Bucket='bucket',
                                   Key='wentao.mp4',
                                   UploadId='2~in_WUwt5z4g7ri1yfT_MiaRqAs8MRXG')

the raised botocore.exceptions.ClientError: An error occurred (MalformedXML) when calling the CompleteMultipartUpload operation: Unknown