Boto3 S3 bucket.copy() not working as documented

results.sh

$ ./test.py
archived/prod/20151119/DMARC-AUTH/archive_prod_2015111911_45_0.json.gz
Traceback (most recent call last):
  File "./test.py", line 28, in <module>
    main()
  File "./test.py", line 25, in main
    bucket.copy(copy_source, key)
AttributeError: 's3.Bucket' object has no attribute 'copy'

# according to the boto3 docs there is a bucket.copy()
# https://boto3.readthedocs.io/en/latest/reference/services/s3.html#S3.Bucket.copy

test.py

#!/usr/bin/env python

import boto3
import sys


def main():
    boto3.setup_default_session(profile_name='datapipeline')
    s3 = boto3.resource('s3')

    source_bucket = 'maelstrom-archive.returnpath.net'
    target_bucket = 'jcrotty-archive-test'
    key = 'archived/prod/20151119/DMARC-AUTH/archive_prod_2015111911_45_0.json.gz'

    print(key)

    # below code lifted directly from boto3 docs
    # https://boto3.readthedocs.io/en/latest/reference/services/s3.html#S3.Bucket.copy
    s3 = boto3.resource('s3')
    copy_source = {
        'Bucket': source_bucket,
        'Key': key
    }
    bucket = s3.Bucket(target_bucket)
    bucket.copy(copy_source, key)

if __name__ == "__main__":
    main()