How can I easily determine if a Boto 3 S3 bucket resource exists?

Question

For example, I have this code:

import boto3

s3 = boto3.resource(\'s3\')

bucket = s3.Bucket(\'my-bucket-name\')

# Does it exist???

Answer 1

you can use conn.get_bucket

from boto.s3.connection import S3Connection
from boto.exception import S3ResponseError    

conn = S3Connection(aws_access_key, aws_secret_key)

try:
    bucket = conn.get_bucket(unique_bucket_name, validate=True)
except S3ResponseError:
    bucket = conn.create_bucket(unique_bucket_name)

quoting the documentation at http://boto.readthedocs.org/en/latest/s3_tut.html

As of Boto v2.25.0, this now performs a HEAD request (less expensive but worse error messages).