アップロード

import boto3

access_key = XXXX
secret_key = XXXX
bucket_name = XXXX

s3 = boto3.client('s3', aws_access_key_id=dl_access_key, aws_secret_access_key=dl_secret_key)

with io.open(local_file_path, 'rb') as f:
    try:
        s3.upload_fileobj(f, bucket_name, s3_file_path)
    except Exception as e:
        raise e

ダウンロード

import boto3

dl_access_key = XXXX
dl_secret_key = XXXX
bucket_name = XXXX

s3 = boto3.client('s3', aws_access_key_id=dl_access_key, aws_secret_access_key=dl_secret_key)

return s3.generate_presigned_url(
    'get_object',
    Params={'Bucket': bucket_name, 'Key': s3_file_path}
)