Pre-sign an S3 URL - Python

sign.py

# Boto setup:
# The file ~/.aws/credentials contains:
# [default]
# region=eu-west-1
# aws_access_key_id=xxxxxx
# aws_secret_access_key=xxxxxx

import boto3
import requests
from botocore.client import Config

# Get the service client.
s3 = boto3.client('s3', config=Config(signature_version='s3v4'))

# Generate the URL to get 'key-name' from 'bucket-name'
url = s3.generate_presigned_url(
            ClientMethod='get_object',
                Params={
                            'Bucket': 'yaronf',
                                    'Key': 'signedObject.txt'
                       }
                )

print url
response = requests.get(url)
print response