This topic describes how to determine whether an object exists.
In this topic, the public endpoint of the China (Hangzhou) region is used. If you want to access OSS by using other Alibaba Cloud services in the same region as OSS, use an internal endpoint. For more information about the regions and endpoints supported by OSS, 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 an object exists, you must have the
oss:GetObjectpermission. For more information, see Attach a custom policy to a RAM user.
# -*- coding: utf-8 -*- import oss2 from oss2.credentials import EnvironmentVariableCredentialsProvider # Obtain access credentials from the environment variables. Before you run the sample code, make sure that you have configured environment variables OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET. auth = oss2.ProviderAuth(EnvironmentVariableCredentialsProvider()) # Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. # Specify the name of the bucket. bucket = oss2.Bucket(auth, 'https://oss-cn-hangzhou.aliyuncs.com', 'yourBucketName') # Specify the full path of the object. Do not include the bucket name in the full path. exist = bucket.object_exists('exampleobject.txt') # If the returned value is true, the specified object exists. If the returned value is false, the specified object does not exist. if exist: print('object exist') else: print('object not exist')