Object Storage Service:Determine whether a bucket exists (Python SDK V1)

Usage notes

• In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS from other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about OSS regions and endpoints, see Regions and endpoints.

• In this topic, access credentials are obtained from environment variables. For more information about how to configure access credentials, see Configure access credentials.

• In this topic, an OSSClient instance is created by using an OSS endpoint. If you want to create an OSSClient instance by using custom domain names or Security Token Service (STS), see Initialization.

• To determine whether a bucket exists, you must have the oss:GetBucketAcl permission. For more information, see Attach a custom policy to a RAM user.

Example code

The following code provides an example of how to determine whether a specified bucket exists:

# -*- coding: utf-8 -*-
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider
# Obtain access credentials from environment variables. Before running this code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are set.
auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())

# Specify the endpoint of the region where the bucket is located. For example, if the bucket is in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com.
endpoint = "https://oss-cn-hangzhou.aliyuncs.com"

# Specify the region that corresponds to the endpoint, for example, cn-hangzhou. Note: This parameter is required for V4 signatures.
region = "cn-hangzhou"

# Replace yourBucketName with the bucket name.
bucket = oss2.Bucket(auth, endpoint, "yourBucketName", region=region)

def does_bucket_exist(bucket):
    try:
        bucket.get_bucket_info()
    except oss2.exceptions.NoSuchBucket:
        return False
    except:
        raise
    return True

# Determine whether the specified bucket exists. A return value of true indicates that the bucket exists. A return value of false indicates that the bucket does not exist.
exist = does_bucket_exist(bucket)
if exist:
    print('bucket exist')
else:
    print('bucket not exist')

References

The complete sample code for this operation is available in the GitHub example.