Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferencePythonObject interfaceList objectsList multiversion objects (Python SDK)
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List multiversion objects (Python SDK)
Copy pageDownload PDFList multiversion objects (Python SDK)
This API is used to list multiversion objects in a bucket. This API returns a maximum of 1,000 multiversion objects in the bucket for each request. You can use request parameters to define the selection criteria for the objects to list.
Notes
To list multiversion objects, you need the tos:ListBucketVersions permission for the bucket. For details, see IAM policy overview.
Parameter description
parameter | description |
parameter | description |
prefix | The prefix for this query result. |
delimiter | The character for grouping object names. |
max_keys | The maximum number of objects to list, default is 1000. Value range: greater than 0 and less than or equal to 1000 |
key_marker | The starting point for listing multiple versions of objects. Objects are listed in alphabetical order after the specified start. Usually the next_marker value returned by the previous request. |
version_id_marker | used with key_marker to return the list of versioned objects sorted lexicographically after this value. retrieved from next_version_id_marker of the last listing result. |
Example code
Simple listing
The following code lists up to 10 multiversion objects in the specified bucket bucket-test.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = 'bucket-test'
prefix = "your prefix"
try:
# Create a TosClientV2 object to perform operations on buckets and objects.
client = tos.TosClientV2(ak, sk, endpoint, region)
out = client.list_object_versions(bucket_name, max_keys=10)
# The version contains information about multiple version objects.
for version in out.versions:
print('object key', version.key)
print('version id', version.version_id)
print('last modified', version.last_modified)
print('is latest version', version.is_latest)
# Delete Markup Information
for delete_marker in out.delete_markers:
print('delete marker key', delete_marker.key)
print('delete marker version id', delete_marker.version_id)
print('delete marker last modified', delete_marker.last_modified)
print('delete marker is latest version', delete_marker.is_latest)
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
List all objects with a specified prefix
The following code lists all the versioned objects and delete markers under the prefix example/ in the bucket bucket-test.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = 'bucket-test'
prefix = "your prefix"
try:
# Create a TosClientV2 object to perform operations on buckets and objects.
client = tos.TosClientV2(ak, sk, endpoint, region)
is_truncated = True
key_marker = ''
version_id_marker = ''
while is_truncated:
out = client.list_object_versions(bucket_name, prefix=prefix, key_marker=key_marker, version_id_marker=version_id_marker)
# version contains information about multiple versions of an object.
for version in out.versions:
print('object key', version.key)
print('version id', version.version_id)
print('last modified', version.last_modified)
print('is latest version', version.is_latest)
# Delete Markup Information
for delete_marker in out.delete_markers:
print('delete marker key', delete_marker.key)
print('delete marker version id', delete_marker.version_id)
print('delete marker last modified', delete_marker.last_modified)
print('delete marker is latest version', delete_marker.is_latest)
is_truncated = out.is_truncated
key_marker = out.next_key_marker
version_id_marker = out.next_version_id_marker
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
List all objects
The following code lists all the versioned objects and delete markers in the bucket bucket-test.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = 'bucket-test'
try:
# Create a TosClientV2 object to perform operations on buckets and objects.
client = tos.TosClientV2(ak, sk, endpoint, region)
is_truncated = True
key_marker = ''
version_id_marker = ''
while is_truncated:
out = client.list_object_versions(bucket_name, key_marker=key_marker, version_id_marker=version_id_marker)
# version contains information about multiple versions of an object.
for version in out.versions:
print('object key', version.key)
print('version id', version.version_id)
print('last modified', version.last_modified)
print('is latest version', version.is_latest)
# Delete Markup Information
for delete_marker in out.delete_markers:
print('delete marker key', delete_marker.key)
print('delete marker version id', delete_marker.version_id)
print('delete marker last modified', delete_marker.last_modified)
print('delete marker is latest version', delete_marker.is_latest)
is_truncated = out.is_truncated
key_marker = out.next_key_marker
version_id_marker = out.next_version_id_marker
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
Recursively list objects and subdirectories in the directory
TOS only has the concept of objects, which can simulate directory functionality by creating an object with size 0 and ending with a slash/to simulate directory functionality.
The directory function can be simulated through the two parameters delimiter and prefix:
- First set delimiter to/and set prefix to empty to return objects and subdirectory information under the root directory.
- Set delimiter to/set prefix as a subdirectory to return objects and subdirectories within it.
the following code lists objects and subdirectories under the directory.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = 'bucket-test'
try:
# Create a TosClientV2 object to perform operations on buckets and objects.
client = tos.TosClientV2(ak, sk, endpoint, region)
# List the files and subfolders in the root directory.
is_truncated = True
next_key_marker = ''
next_version_id_marker = ''
while is_truncated:
out = client.list_object_versions(bucket_name, delimiter="/", key_marker=next_key_marker, version_id_marker=next_version_id_marker)
for prefix in out.common_prefixes:
print("subDir", prefix.prefix)
for version in out.versions:
print('object key', version.key)
print('version id', version.version_id)
print('last modified', version.last_modified)
print('is latest version', version.is_latest)
is_truncated = out.is_truncated
next_key_marker = out.next_key_marker
next_version_id_marker = out.next_version_id_marker
# List the files and subfolders in the root directory.
is_truncated = True
next_key_marker = ''
next_version_id_marker = ''
while is_truncated:
out = client.list_object_versions(bucket_name, prefix="CLion.app/", delimiter="/", key_marker=next_key_marker, version_id_marker=next_version_id_marker)
for prefix in out.common_prefixes:
print("subDir", prefix.prefix)
for version in out.versions:
print('object key', version.key)
print('version id', version.version_id)
print('last modified', version.last_modified)
print('is latest version', version.is_latest)
is_truncated = out.is_truncated
next_key_marker = out.next_key_marker
next_version_id_marker = out.next_version_id_marker
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
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Last updated: 2025.09.17 18:22:11
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