Add Bucket Tags to all S3 Buckets

bucket_tags.py

import boto3

s3 = boto3.resource('s3')

for bucket in s3.buckets.all():
  tags = s3.BucketTagging(bucket.name)
  try:  
    bucket_tags = [t for t in tags.tag_set if t['Key'] == 'bucket']
    if len(bucket_tags) == 0:
      tags.put(Tagging={'TagSet':tags.tag_set.append({'Key': 'bucket', 'Value': bucket.name})})
  except:
    try:
      tags.put(Tagging={'TagSet':[{'Key': 'bucket', 'Value': bucket.name}]})
    except:
      pass