Class Client (2.7.0)

Client(project=<objectobject>,credentials=None,_http=None,client_info=None,client_options=None,use_auth_w_custom_endpoint=True)

Client to bundle configuration needed for API requests.

Parameters
Name	Description
`project`	`str or None` the project which the client acts on behalf of. Will be passed when creating a topic. If not passed, falls back to the default inferred from the environment.
`credentials`	`google.auth.credentials.Credentials` (Optional) The OAuth2 Credentials to use for this client. If not passed (and if no`_http` object is passed), falls back to the default inferred from the environment.
`_http`	`requests.Session` (Optional) HTTP object to make requests. Can be any object that defines`request()` with the same interface as`requests.Session.request`. If not passed, an`_http` object is created that is bound to the`credentials` for the current object. This parameter should be considered private, and could change in the future.
`client_info`	`google.api_core.client_info.ClientInfo` The client info used to send a user-agent string along with API requests. If`None`, then default info will be used. Generally, you only need to set this if you're developing your own library or partner tool.
`client_options`	`google.api_core.client_options.ClientOptions ordict` (Optional) Client options used to set user options on the client. API Endpoint should be set through client_options.
`use_auth_w_custom_endpoint`	`bool` (Optional) Whether authentication is required under custom endpoints. If false, uses AnonymousCredentials and bypasses authentication. Defaults to True. Note this is only used when a custom endpoint is set in conjunction.

Properties

current_batch

Currently-active batch.

Returns
Type	Description
`Batch orNoneType (if no batch is active).`	The batch at the top of the batch stack.

Methods

batch

batch()

Factory constructor for batch object.

Note:This will not make an HTTP request; it simply instantiatesa batch object owned by this client.

Returns
Type	Description
`Batch`	The batch object created.

bucket

bucket(bucket_name,user_project=None)

Factory constructor for bucket object.

Note:This will not make an HTTP request; it simply instantiatesa bucket object owned by this client.

Parameters
Name	Description
`bucket_name`	`str` The name of the bucket to be instantiated.
`user_project`	`str` (Optional) The project ID to be billed for API requests made via the bucket.

Returns
Type	Description
`Bucket`	The bucket object created.

create_anonymous_client

create_anonymous_client()

Factory: return client with anonymous credentials.

Note:Such a client has only limited access to "public" buckets:listing their contents and downloading their blobs.

Returns
Type	Description
`Client`	Instance w/ anonymous credentials and no project.

create_bucket

create_bucket(bucket_or_name,requester_pays=None,project=None,user_project=None,location=None,data_locations=None,predefined_acl=None,predefined_default_object_acl=None,timeout=60,retry=<google.api_core.retry.Retryobject>)

Create a new bucket via a POST request.

See API reference docs and acode sample.

Parameters
Name	Description
`bucket_or_name`	`Union[Bucket, str, ]` The bucket resource to pass or name to create.
`requester_pays`	`bool` DEPRECATED. Use Bucket().requester_pays instead. (Optional) Whether requester pays for API requests for this bucket and its blobs.
`project`	`str` (Optional) The project under which the bucket is to be created. If not passed, uses the project set on the client.
`user_project`	`str` (Optional) The project ID to be billed for API requests made via created bucket.
`location`	`str` (Optional) The location of the bucket. If not passed, the default location, US, will be used. If specifying a dual-region,`data_locations` should be set in conjunction. See:https://cloud.google.com/storage/docs/locations
`data_locations`	`list of str` (Optional) The list of regional locations of a custom dual-region bucket. Dual-regions require exactly 2 regional locations. See:https://cloud.google.com/storage/docs/locations
`predefined_acl`	`str` (Optional) Name of predefined ACL to apply to bucket. See:https://cloud.google.com/storage/docs/access-control/lists#predefined-acl
`predefined_default_object_acl`	`str` (Optional) Name of predefined ACL to apply to bucket's objects. See:https://cloud.google.com/storage/docs/access-control/lists#predefined-acl
`timeout`	`Optional[Union[float, Tuple[float, float]]]` The amount of time, in seconds, to wait for the server response. Can also be passed as a tuple (connect_timeout, read_timeout). See`requests.Session.request` documentation for details.
`retry`	`Optional[Union[google.api_core.retry.Retry,google.cloud.storage.retry.ConditionalRetryPolicy]]` How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. Agoogle.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them.

Exceptions
Type	Description
`google.cloud.exceptions.Conflict`	If the bucket already exists.

create_hmac_key

create_hmac_key(service_account_email,project_id=None,user_project=None,timeout=60,retry=None)

Create an HMAC key for a service account.

Parameters
Name	Description
`service_account_email`	`str` e-mail address of the service account
`project_id`	`str` (Optional) Explicit project ID for the key. Defaults to the client's project.
`user_project`	`str` (Optional) This parameter is currently ignored.
`timeout`	`float or tuple` (Optional) The amount of time, in seconds, to wait for the server response. See:`configuring_timeouts`
`retry`	`google.api_core.retry.Retry orgoogle.cloud.storage.retry.ConditionalRetryPolicy` (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. Agoogle.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them.

Returns
Type	Description
`Tuple[HMACKeyMetadata, str]`	metadata for the created key, plus the bytes of the key's secret, which is an 40-character base64-encoded string.

download_blob_to_file

download_blob_to_file(blob_or_uri,file_obj,start=None,end=None,raw_download=False,if_etag_match=None,if_etag_not_match=None,if_generation_match=None,if_generation_not_match=None,if_metageneration_match=None,if_metageneration_not_match=None,timeout=60,checksum='md5',retry=<google.api_core.retry.Retryobject>)

Download the contents of a blob object or blob URI into a file-like object.

Seehttps://cloud.google.com/storage/docs/downloading-objects

Parameters
Name	Description
`blob_or_uri`	`Union[Blob, str, ]` The blob resource to pass or URI to download.
`file_obj`	`file` A file handle to which to write the blob's data.
`start`	`int` (Optional) The first byte in a range to be downloaded.
`end`	`int` (Optional) The last byte in a range to be downloaded.
`raw_download`	`bool` (Optional) If true, download the object without any expansion.
`if_etag_match`	`Union[str, Set[str]]` (Optional) See :ref:`using-if-etag-match`
`if_etag_not_match`	`Union[str, Set[str]]` (Optional) See :ref:`using-if-etag-not-match`
`if_generation_match`	`long` (Optional) See :ref:`using-if-generation-match`
`if_generation_not_match`	`long` (Optional) See :ref:`using-if-generation-not-match`
`if_metageneration_match`	`long` (Optional) See :ref:`using-if-metageneration-match`
`if_metageneration_not_match`	`long` (Optional) See :ref:`using-if-metageneration-not-match`
`timeout`	`[Union[float, Tuple[float, float]]]` (Optional) The amount of time, in seconds, to wait for the server response. See:`configuring_timeouts`
`checksum`	`str` (Optional) The type of checksum to compute to verify the integrity of the object. The response headers must contain a checksum of the requested type. If the headers lack an appropriate checksum (for instance in the case of transcoded or ranged downloads where the remote service does not know the correct checksum, including downloads where chunk_size is set) an INFO-level log will be emitted. Supported values are "md5", "crc32c" and None. The default is "md5".
`retry`	`google.api_core.retry.Retry orgoogle.cloud.storage.retry.ConditionalRetryPolicy` (Optional) How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. Agoogle.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them. Media operations (downloads and uploads) do not support non-default predicates in a Retry object. The default will always be used. Other configuration changes for Retry objects such as delays and deadlines are respected.

generate_signed_post_policy_v4

generate_signed_post_policy_v4(bucket_name,blob_name,expiration,conditions=None,fields=None,credentials=None,virtual_hosted_style=False,bucket_bound_hostname=None,scheme="http",service_account_email=None,access_token=None,)

Generate a V4 signed policy object. Generated policy object allows user to upload objects with a POST request.

Note:Assumescredentials implements thegoogle.auth.credentials.Signing interface. Also assumescredentials has aservice_account_email property whichidentifies the credentials.

Parameters
Name	Description
`bucket_name`	`str` Bucket name.
`blob_name`	`str` Object name.
`expiration`	`Union[Integer, datetime.datetime, datetime.timedelta]` Policy expiration time. If a`datetime` instance is passed without an explicit`tzinfo` set, it will be assumed to be`UTC`.
`conditions`	`list` (Optional) List of POST policy conditions, which are used to restrict what is allowed in the request.
`fields`	`dict` (Optional) Additional elements to include into request.
`credentials`	`google.auth.credentials.Signing` (Optional) Credentials object with an associated private key to sign text.
`virtual_hosted_style`	`bool` (Optional) If True, construct the URL relative to the bucket virtual hostname, e.g., '
`bucket_bound_hostname`	`str` (Optional) If passed, construct the URL relative to the bucket-bound hostname. Value can be bare or with a scheme, e.g., 'example.com' or 'http://example.com'. See:https://cloud.google.com/storage/docs/request-endpoints#cname
`scheme`	`str` (Optional) If`bucket_bound_hostname` is passed as a bare hostname, use this value as a scheme.`https` will work only when using a CDN. Defaults to`"http"`.
`service_account_email`	`str` (Optional) E-mail address of the service account.
`access_token`	`str` (Optional) Access token for a service account.

Returns
Type	Description
`dict`	Signed POST policy.

get_bucket

get_bucket(bucket_or_name,timeout=60,if_metageneration_match=None,if_metageneration_not_match=None,retry=<google.api_core.retry.Retryobject>)

Retrieve a bucket via a GET request.

See API reference docs and acode sample.

Parameters
Name	Description
`bucket_or_name`	`Union[Bucket, str, ]` The bucket resource to pass or name to create.
`timeout`	`Optional[Union[float, Tuple[float, float]]]` The amount of time, in seconds, to wait for the server response. Can also be passed as a tuple (connect_timeout, read_timeout). See`requests.Session.request` documentation for details.
`if_metageneration_match`	`Optional[long]` Make the operation conditional on whether the blob's current metageneration matches the given value.
`if_metageneration_not_match`	`Optional[long]` Make the operation conditional on whether the blob's current metageneration does not match the given value.
`retry`	`Optional[Union[google.api_core.retry.Retry,google.cloud.storage.retry.ConditionalRetryPolicy]]` How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. Agoogle.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them.

Exceptions
Type	Description
`google.cloud.exceptions.NotFound`	If the bucket is not found.

get_hmac_key_metadata

get_hmac_key_metadata(access_id,project_id=None,user_project=None,timeout=60)

Return a metadata instance for the given HMAC key.

Parameters
Name	Description
`access_id`	`str` Unique ID of an existing key.
`project_id`	`str` (Optional) Project ID of an existing key. Defaults to client's project.
`timeout`	`float or tuple` (Optional) The amount of time, in seconds, to wait for the server response. See:`configuring_timeouts`
`user_project`	`str` (Optional) This parameter is currently ignored.

get_service_account_email

get_service_account_email(project=None,timeout=60,retry=<google.api_core.retry.Retryobject>)

Get the email address of the project's GCS service account

Parameters
Name	Description
`project`	`str` (Optional) Project ID to use for retreiving GCS service account email address. Defaults to the client's project.
`timeout`	`float or tuple` (Optional) The amount of time, in seconds, to wait for the server response. See:`configuring_timeouts`
`retry`	`google.api_core.retry.Retry orgoogle.cloud.storage.retry.ConditionalRetryPolicy` (Optional) How to retry the RPC. See:`configuring_retries`

Returns
Type	Description
`str`	service account email address

list_blobs

list_blobs(bucket_or_name,max_results=None,page_token=None,prefix=None,delimiter=None,start_offset=None,end_offset=None,include_trailing_delimiter=None,versions=None,projection='noAcl',fields=None,page_size=None,timeout=60,retry=<google.api_core.retry.Retryobject>)

Return an iterator used to find blobs in the bucket.

Ifuser_project is set, bills the API request to that project.

Note:List prefixes (directories) in a bucket using a prefix and delimiter.See a code samplelisting objects using a prefix filter.

Parameters
Name	Description
`bucket_or_name`	`Union[Bucket, str, ]` The bucket resource to pass or name to create.
`max_results`	`int` (Optional) The maximum number of blobs to return.
`page_token`	`str` (Optional) If present, return the next batch of blobs, using the value, which must correspond to the`nextPageToken` value returned in the previous response. Deprecated: use the`pages` property of the returned iterator instead of manually passing the token.
`prefix`	`str` (Optional) Prefix used to filter blobs.
`delimiter`	`str` (Optional) Delimiter, used with`prefix` to emulate hierarchy.
`start_offset`	`str` (Optional) Filter results to objects whose names are lexicographically equal to or after`startOffset`. If`endOffset` is also set, the objects listed will have names between`startOffset` (inclusive) and`endOffset` (exclusive).
`end_offset`	`str` (Optional) Filter results to objects whose names are lexicographically before`endOffset`. If`startOffset` is also set, the objects listed will have names between`startOffset` (inclusive) and`endOffset` (exclusive).
`include_trailing_delimiter`	`boolean` (Optional) If true, objects that end in exactly one instance of`delimiter` will have their metadata included in`items` in addition to`prefixes`.
`versions`	`bool` (Optional) Whether object versions should be returned as separate blobs.
`projection`	`str` (Optional) If used, must be 'full' or 'noAcl'. Defaults to`'noAcl'`. Specifies the set of properties to return.
`fields`	`str` (Optional) Selector specifying which fields to include in a partial response. Must be a list of fields. For example to get a partial response with just the next page token and the name and language of each blob returned:`'items(name,contentLanguage),nextPageToken'`. See:https://cloud.google.com/storage/docs/json_api/v1/parameters#fields
`page_size`	`int` (Optional) Maximum number of blobs to return in each page. Defaults to a value set by the API.
`timeout`	`Optional[Union[float, Tuple[float, float]]]` The amount of time, in seconds, to wait for the server response. Can also be passed as a tuple (connect_timeout, read_timeout). See`requests.Session.request` documentation for details.
`retry`	`Optional[Union[google.api_core.retry.Retry,google.cloud.storage.retry.ConditionalRetryPolicy]]` How to retry the RPC. A None value will disable retries. A google.api_core.retry.Retry value will enable retries, and the object will define retriable response codes and errors and configure backoff and timeout options. Agoogle.cloud.storage.retry.ConditionalRetryPolicy value wraps a Retry object and activates it only if certain conditions are met. This class exists to provide safe defaults for RPC calls that are not technically safe to retry normally (due to potential data duplication or other side-effects) but become safe to retry if a condition such as if_metageneration_match is set. See the retry.py source code and docstrings in this package (google.cloud.storage.retry) for information on retry types and how to configure them.

list_buckets

list_buckets(max_results=None,page_token=None,prefix=None,projection='noAcl',fields=None,project=None,page_size=None,timeout=60,retry=<google.api_core.retry.Retryobject>)

Get all buckets in the project associated to the client.

This will not populate the list of blobs available in eachbucket.

SeeAPI reference docs and acode sample.

Parameters
Name	Description
`max_results`	`int` (Optional) The maximum number of buckets to return.
`page_token`	`str` (Optional) If present, return the next batch of buckets, using the value, which must correspond to the`nextPageToken` value returned in the previous response. Deprecated: use the`pages` property of the returned iterator instead of manually passing the token.
`prefix`	`str` (Optional) Filter results to buckets whose names begin with this prefix.
`projection`	`str` (Optional) Specifies the set of properties to return. If used, must be 'full' or 'noAcl'. Defaults to 'noAcl'.
`fields`	`str` (Optional) Selector specifying which fields to include in a partial response. Must be a list of fields. For example to get a partial response with just the next page token and the language of each bucket returned: 'items/id,nextPageToken'
`project`	`str` (Optional) The project whose buckets are to be listed. If not passed, uses the project set on the client.
`page_size`	`int` (Optional) Maximum number of buckets to return in each page. Defaults to a value set by the API.
`timeout`	`float or tuple` (Optional) The amount of time, in seconds, to wait for the server response. See:`configuring_timeouts`
`retry`	`google.api_core.retry.Retry orgoogle.cloud.storage.retry.ConditionalRetryPolicy` (Optional) How to retry the RPC. See:`configuring_retries`

Exceptions
Type	Description
`ValueError`	if both`project` is`None` and the client's project is also`None`.

Returns
Type	Description
`google.api_core.page_iterator.Iterator`	Iterator of allBucket belonging to this project.

list_hmac_keys

list_hmac_keys(max_results=None,service_account_email=None,show_deleted_keys=None,project_id=None,user_project=None,timeout=60,retry=<google.api_core.retry.Retryobject>)

List HMAC keys for a project.

Parameters
Name	Description
`max_results`	`int` (Optional) Max number of keys to return in a given page.
`service_account_email`	`str` (Optional) Limit keys to those created by the given service account.
`show_deleted_keys`	`bool` (Optional) Included deleted keys in the list. Default is to exclude them.
`project_id`	`str` (Optional) Explicit project ID for the key. Defaults to the client's project.
`user_project`	`str` (Optional) This parameter is currently ignored.
`timeout`	`float or tuple` (Optional) The amount of time, in seconds, to wait for the server response. See:`configuring_timeouts`
`retry`	`google.api_core.retry.Retry orgoogle.cloud.storage.retry.ConditionalRetryPolicy` (Optional) How to retry the RPC. See:`configuring_retries`

Returns
Type	Description
`Tuple[HMACKeyMetadata, str]`	metadata for the created key, plus the bytes of the key's secret, which is an 40-character base64-encoded string.

lookup_bucket

lookup_bucket(bucket_name,timeout=60,if_metageneration_match=None,if_metageneration_not_match=None,retry=<google.api_core.retry.Retryobject>)

Get a bucket by name, returning None if not found.

You can use this if you would rather check for a None valuethan catching a NotFound exception.

Parameters
Name	Description
`bucket_name`	`str` The name of the bucket to get.
`timeout`	`float or tuple` (Optional) The amount of time, in seconds, to wait for the server response. See:`configuring_timeouts`
`if_metageneration_match`	`long` (Optional) Make the operation conditional on whether the blob's current metageneration matches the given value.
`if_metageneration_not_match`	`long` (Optional) Make the operation conditional on whether the blob's current metageneration does not match the given value.
`retry`	`google.api_core.retry.Retry orgoogle.cloud.storage.retry.ConditionalRetryPolicy` (Optional) How to retry the RPC. See:`configuring_retries`

Returns
Type	Description
`Bucket orNoneType`	The bucket matching the name provided or None if not found.

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Last updated 2025-11-05 UTC.

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