Problem Statement − Use Boto3 library in Python to determine whether a root bucket exists in S3 or not.
Example − Bucket_1 exists or not in S3.
Approach/Algorithm to solve this problem
Step 1 − Import boto3 and botocore exceptions to handle exceptions.
Step 2 − Create an AWS session using boto3 library.
Step 3 − Create an AWS client for S3.
Step 4 − Use the function head_bucket(). It returns 200 OK if the bucket exists and the user has permission to access it. Otherwise, the response would be 403 Forbidden or 404 Not Found.
Step 5 − Handle the exception based on the response code.
Step 6 − Return True/False based on whether the bucket exists or not.
Example
The following code checks whether the root bucket exists in S3 −
import boto3
from botocore.exceptions import ClientError
# To check whether root bucket exists or not
def bucket_exists(bucket_name):
try:
session = boto3.session.Session()
# User can pass customized access key, secret_key and token as well
s3_client = session.client('s3')
s3_client.head_bucket(Bucket=bucket_name)
print("Bucket exists.", bucket_name)
exists = True
except ClientError as error:
error_code = int(error.response['Error']['Code'])
if error_code == 403:
print("Private Bucket. Forbidden Access! ", bucket_name)
elif error_code == 404:
print("Bucket Does Not Exist!", bucket_name)
exists = False
return exists
print(bucket_exists('bucket_1'))
print(bucket_exists('AWS_bucket_1'))Output
Bucket exists. bucket_1 True Bucket Does Not Exist! AWS_bucket_1 False