Adds tags for creation date to objects in an S3 bucket. Useful if you've just used `aws s3 sync` and want to add metadata.

creation_date_s3_tags.py

from __future__ import print_function
import os
import sys
from datetime import datetime
import boto3

walk_dir = "/Volumes/MyFiles"

client = boto3.client('s3')
bucket = "MyBucket"

print('walk_dir = ' + walk_dir)
print('walk_dir (absolute) = ' + os.path.abspath(walk_dir))

for root, subdirs, files in os.walk(walk_dir):
    print('--\nroot = ' + root)
    for filename in files:
        try:
            file_path = os.path.join(root, filename)
            time = datetime.utcfromtimestamp(os.path.getmtime(file_path))
            key = os.path.relpath(file_path, walk_dir)
            print("Created: {1}, Key: {0};".format(key, time))
            client.put_object_tagging(
                Bucket=bucket, Key=key,
                Tagging={"TagSet": [
                    {
                        "Key": "CreationDate",
                        "Value": unicode(time)
                    }
                ]}
            )
        except Exception as e:
            print(e, file=sys.stderr)