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

I tried Daniel's example and it was really helpful. Followed up the boto3 documentation and here is my clean test code. I have added a check for '403' error when buckets are private and return a 'Forbidden!' error.

import boto3, botocore
s3 = boto3.resource('s3')
bucket_name = 'some-private-bucket'
#bucket_name = 'bucket-to-check'

bucket = s3.Bucket(bucket_name)
def check_bucket(bucket):
    try:
        s3.meta.client.head_bucket(Bucket=bucket_name)
        print("Bucket Exists!")
        return True
    except botocore.exceptions.ClientError as e:
        # If a client error is thrown, then check that it was a 404 error.
        # If it was a 404 error, then the bucket does not exist.
        error_code = int(e.response['Error']['Code'])
        if error_code == 403:
            print("Private Bucket. Forbidden Access!")
            return True
        elif error_code == 404:
            print("Bucket Does Not Exist!")
            return False

check_bucket(bucket)

Hope this helps some new into boto3 like me.