image tweet with S3 in Lambda

lambda_function.py

import os
import sys
import uuid
import boto3
import tweepy
from urllib.parse import unquote_plus

# Twitter authentication variables
consumer_key = os.environ.get('TWITTER_CONSUMER_KEY', 'ap-northeast-1')
consumer_secret = os.environ.get('TWITTER_CONSUMER_SECRET', 'ap-northeast-1')
access_token = os.environ.get('TWITTER_ACCESS_TOKEN', 'ap-northeast-1')
access_secret = os.environ.get('TWITTER_ACCESS_SECRET', 'ap-northeast-1')

def tweet_with_image(path):
    try:
        auth = tweepy.OAuthHandler(consumer_key, consumer_secret)
        auth.set_access_token(access_token, access_secret)
        api = tweepy.API(auth)

        if os.path.exists(path):
            api.update_with_media(filename=path)
        else:
            print('empty tweet')
    except Exception as e:
        print(e)
        raise e

def lambda_handler(event, context):
    for record in event['Records']:
        bucket = record['s3']['bucket']['name'] # retrieve bucket name from record
        key = unquote_plus(record['s3']['object']['key']
        splitkey = key.split('/') # split folder name and key name
        download_path = '/tmp/{}-{}'.format(uuid.uuid4(), splitkey[1])
        s3_client.download_file(bucket, key, download_path)

        # tweet a post with downloaded image
        tweet_with_image(download_path)

# call lambda_hander
if __name__ == "__main__":
    lambda_handler(json.loads(sys.argv[1]), {})