Class Blob (2.15.0)

Version 2.15.0

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Blob(
    name,
    bucket,
    chunk_size=None,
    encryption_key=None,
    kms_key_name=None,
    generation=None,
)

A wrapper around Cloud Storage's concept of an Object.

Parameters
Name	Description
name	str The name of the blob. This corresponds to the unique path of the object in the bucket. If bytes, will be converted to a unicode object. Blob / object names can contain any sequence of valid unicode characters, of length 1-1024 bytes when UTF-8 encoded.
bucket	Bucket The bucket to which this blob belongs.
chunk_size	int (Optional) The size of a chunk of data whenever iterating (in bytes). This must be a multiple of 256 KB per the API specification. If not specified, the chunk_size of the blob itself is used. If that is not specified, a default value of 40 MB is used.
encryption_key	bytes (Optional) 32 byte encryption key for customer-supplied encryption. See https://cloud.google.com/storage/docs/encryption#customer-supplied.
kms_key_name	str (Optional) Resource name of Cloud KMS key used to encrypt the blob's contents.
generation	long (Optional) If present, selects a specific revision of this object.

Properties

acl

Create our ACL on demand.

bucket

Bucket which contains the object.

Returns
Type	Description
Bucket	The object's bucket.

cache_control

Scalar property getter.

chunk_size

Get the blob's default chunk size.

Returns
Type	Description
int or NoneType	The current blob's chunk size, if it is set.

client

The client bound to this blob.

component_count

Number of underlying components that make up this object.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
int or NoneType	The component count (in case of a composed object) or None if the blob's resource has not been loaded from the server. This property will not be set on objects not created via compose.

content_disposition

Scalar property getter.

content_encoding

Scalar property getter.

content_language

Scalar property getter.

content_type

Scalar property getter.

crc32c

Scalar property getter.

custom_time

Retrieve the custom time for the object.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
datetime.datetime or NoneType	Datetime object parsed from RFC3339 valid timestamp, or None if the blob's resource has not been loaded from the server (see reload).

encryption_key

Retrieve the customer-supplied encryption key for the object.

Returns
Type	Description
bytes or NoneType	The encryption key or None if no customer-supplied encryption key was used, or the blob's resource has not been loaded from the server.

etag

Retrieve the ETag for the object.

See RFC 2616 (etags) and API reference docs.

Returns
Type	Description
str or NoneType	The blob etag or None if the blob's resource has not been loaded from the server.

event_based_hold

Scalar property getter.

generation

Retrieve the generation for the object.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
int or NoneType	The generation of the blob or None if the blob's resource has not been loaded from the server.

id

Retrieve the ID for the object.

See https://cloud.google.com/storage/docs/json_api/v1/objects

The ID consists of the bucket name, object name, and generation number.

Returns
Type	Description
str or NoneType	The ID of the blob or None if the blob's resource has not been loaded from the server.

kms_key_name

Resource name of Cloud KMS key used to encrypt the blob's contents.

Returns
Type	Description
str or NoneType	The resource name or None if no Cloud KMS key was used, or the blob's resource has not been loaded from the server.

md5_hash

Scalar property getter.

media_link

Retrieve the media download URI for the object.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
str or NoneType	The media link for the blob or None if the blob's resource has not been loaded from the server.

metadata

Retrieve arbitrary/application specific metadata for the object.

See https://cloud.google.com/storage/docs/json_api/v1/objects

:setter: Update arbitrary/application specific metadata for the object. :getter: Retrieve arbitrary/application specific metadata for the object.

Returns
Type	Description
dict or NoneType	The metadata associated with the blob or None if the property is not set.

metageneration

Retrieve the metageneration for the object.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
int or NoneType	The metageneration of the blob or None if the blob's resource has not been loaded from the server.

owner

Retrieve info about the owner of the object.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
dict or NoneType	Mapping of owner's role/ID, or None if the blob's resource has not been loaded from the server.

path

Getter property for the URL path to this Blob.

Returns
Type	Description
str	The URL path to this Blob.

public_url

The public URL for this blob.

Use make_public to enable anonymous access via the returned URL.

Returns
Type	Description
string	The public URL for this blob.

retention

Retrieve the retention configuration for this object.

Returns
Type	Description
Retention	an instance for managing the object's retention configuration.

retention_expiration_time

Retrieve timestamp at which the object's retention period expires.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
datetime.datetime or NoneType	Datetime object parsed from RFC3339 valid timestamp, or None if the property is not set locally.

self_link

Retrieve the URI for the object.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
str or NoneType	The self link for the blob or None if the blob's resource has not been loaded from the server.

size

Size of the object, in bytes.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
int or NoneType	The size of the blob or None if the blob's resource has not been loaded from the server.

storage_class

Scalar property getter.

temporary_hold

Scalar property getter.

time_created

Retrieve the timestamp at which the object was created.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
datetime.datetime or NoneType	Datetime object parsed from RFC3339 valid timestamp, or None if the blob's resource has not been loaded from the server (see reload).

time_deleted

Retrieve the timestamp at which the object was deleted.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
datetime.datetime or NoneType	Datetime object parsed from RFC3339 valid timestamp, or None if the blob's resource has not been loaded from the server (see reload). If the blob has not been deleted, this will never be set.

updated

Retrieve the timestamp at which the object was updated.

See https://cloud.google.com/storage/docs/json_api/v1/objects

Returns
Type	Description
datetime.datetime or NoneType	Datetime object parsed from RFC3339 valid timestamp, or None if the blob's resource has not been loaded from the server (see reload).

user_project

Project ID billed for API requests made via this blob.

Derived from bucket's value.

Methods

Blob

Blob(
    name,
    bucket,
    chunk_size=None,
    encryption_key=None,
    kms_key_name=None,
    generation=None,
)

property name Get the blob's name.

compose

compose(sources, client=None, timeout=60, if_generation_match=None, if_metageneration_match=None, if_source_generation_match=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Concatenate source blobs into this one.

If user_project is set on the bucket, bills the API request to that project.

See API reference docs and a code sample.

Parameters
Name	Description
sources	list of Blob Blobs whose contents will be composed into this blob.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
if_generation_match	long (Optional) Makes the operation conditional on whether the destination object's current generation matches the given value. Setting to 0 makes the operation succeed only if there are no live versions of the object. Note: In a previous version, this argument worked identically to the if_source_generation_match argument. For backwards-compatibility reasons, if a list is passed in, this argument will behave like if_source_generation_match and also issue a DeprecationWarning.
if_metageneration_match	long (Optional) Makes the operation conditional on whether the destination object's current metageneration matches the given value. If a list of long is passed in, no match operation will be performed. (Deprecated: type(list of long) is supported for backwards-compatability reasons only.)
if_source_generation_match	list of long (Optional) Makes the operation conditional on whether the current generation of each source blob matches the corresponding generation. The list must match sources item-to-item.
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

create_resumable_upload_session

create_resumable_upload_session(content_type=None, size=None, origin=None, client=None, timeout=60, checksum=None, predefined_acl=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Create a resumable upload session.

Resumable upload sessions allow you to start an upload session from one client and complete the session in another. This method is called by the initiator to set the metadata and limits. The initiator then passes the session URL to the client that will upload the binary data. The client performs a PUT request on the session URL to complete the upload. This process allows untrusted clients to upload to an access-controlled bucket.

For more details, see the documentation on signed URLs.

The content type of the upload will be determined in order of precedence:

• The value passed in to this method (if not :data:None)
• The value stored on the current blob
• The default value ('application/octet-stream')

Note: The effect of uploading to an existing blob depends on the "versioning" and "lifecycle" policies defined on the blob's bucket. In the absence of those policies, upload will overwrite any existing contents.

See the object versioning and lifecycle API documents for details.

If encryption_key is set, the blob will be encrypted with a customer-supplied encryption key.

If user_project is set on the bucket, bills the API request to that project.

Parameters
Name	Description
size	int (Optional) The maximum number of bytes that can be uploaded using this session. If the size is not known when creating the session, this should be left blank.
content_type	str (Optional) Type of content being uploaded.
origin	str (Optional) If set, the upload can only be completed by a user-agent that uploads from the given origin. This can be useful when passing the session to a web client.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
timeout	float or tuple (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. After the upload is complete, the server-computed checksum of the resulting object will be checked and google.resumable_media.common.DataCorruption will be raised on a mismatch. On a validation failure, the client will attempt to delete the uploaded object automatically. Supported values are "md5", "crc32c" and None. The default is None.
predefined_acl	str (Optional) Predefined access control list
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
retry	google.api_core.retry.Retry or google.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. A google.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_generation_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.

Exceptions
Type	Description
GoogleCloudError	if the session creation response returns an error status.

Returns
Type	Description
str	The resumable upload session URL. The upload can be completed by making an HTTP PUT request with the file's contents.

delete

delete(client=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Deletes a blob from Cloud Storage.

If user_project is set on the bucket, bills the API request to that project.

Parameters
Name	Description
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
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	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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Exceptions
Type	Description
NotFound	(propagated from delete_blob).

download_as_bytes

download_as_bytes(client=None, 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.retry_unary.Retry object>)

Download the contents of this blob as a bytes object.

If user_project is set on the bucket, bills the API request to that project.

Parameters
Name	Description
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
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	float or tuple (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 or google.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. A google.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.

Exceptions
Type	Description
NotFound

Returns
Type	Description
bytes	The data stored in this blob.

download_as_string

download_as_string(client=None, 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, retry=<google.api_core.retry.retry_unary.Retry object>)

(Deprecated) Download the contents of this blob as a bytes object.

If user_project is set on the bucket, bills the API request to that project.

Note: Deprecated alias for download_as_bytes.

Parameters
Name	Description
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
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	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 or google.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. A google.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.

Exceptions
Type	Description
NotFound

Returns
Type	Description
bytes	The data stored in this blob.

download_as_text

download_as_text(client=None, start=None, end=None, raw_download=False, encoding=None, 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, retry=<google.api_core.retry.retry_unary.Retry object>)

Download the contents of this blob as text (not bytes).

If user_project is set on the bucket, bills the API request to that project.

Parameters
Name	Description
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
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.
encoding	str (Optional) encoding to be used to decode the downloaded bytes. Defaults to the charset param of attr:content_type, or else to "utf-8".
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	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 or google.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. A google.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.

Returns
Type	Description
text	The data stored in this blob, decoded to text.

download_to_file

download_to_file(file_obj, client=None, 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.retry_unary.Retry object>)

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

Note: If the server-set property, media_link, is not yet initialized, makes an additional API request to load it.

For more fine-grained control over the download process, check out google-resumable-media. For example, this library allows downloading parts of a blob rather than the whole thing.

If user_project is set on the bucket, bills the API request to that project.

Parameters
Name	Description
file_obj	file A file handle to which to write the blob's data.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
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	float or tuple (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 or google.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. A google.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.

Exceptions
Type	Description
NotFound

download_to_filename

download_to_filename(filename, client=None, 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.retry_unary.Retry object>)

Download the contents of this blob into a named file.

If user_project is set on the bucket, bills the API request to that project.

See a code sample to download a file with a customer-supplied encryption key.

Parameters
Name	Description
filename	str A filename to be passed to open.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
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	float or tuple (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 or google.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. A google.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.

Exceptions
Type	Description
NotFound

exists

exists(client=None, 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, retry=<google.api_core.retry.retry_unary.Retry object>)

Determines whether or not this blob exists.

If user_project is set on the bucket, bills the API request to that project.

Parameters
Name	Description
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
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	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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
bool	True if the blob exists in Cloud Storage.

from_string

from_string(uri, client=None)

Get a constructor for blob object by URI.

from google.cloud import storage
from google.cloud.storage.blob import Blob
client = storage.Client()
blob = Blob.from_string("gs://bucket/object", client=client)

Parameters
Name	Description
uri	str The blob uri following a gs://bucket/object pattern. Both a bucket and object name is required to construct a blob object.
client	Client (Optional) The client to use. Application code should always pass client.

Returns
Type	Description
Blob	The blob object created.

generate_signed_url

generate_signed_url(
    expiration=None,
    api_access_endpoint=None,
    method="GET",
    content_md5=None,
    content_type=None,
    response_disposition=None,
    response_type=None,
    generation=None,
    headers=None,
    query_parameters=None,
    client=None,
    credentials=None,
    version=None,
    service_account_email=None,
    access_token=None,
    virtual_hosted_style=False,
    bucket_bound_hostname=None,
    scheme="http",
)

Generates a signed URL for this blob.

Note: If you are on Google Compute Engine, you can't generate a signed URL using GCE service account. If you'd like to be able to generate a signed URL from GCE, you can use a standard service account from a JSON file rather than a GCE service account.

See a code sample.

This is particularly useful if you don't want publicly accessible blobs, but don't want to require users to explicitly log in.

If bucket_bound_hostname is set as an argument of api_access_endpoint, https works only if using a CDN.

Parameters
Name	Description
expiration	Union[Integer, datetime.datetime, datetime.timedelta] Point in time when the signed URL should expire. If a datetime instance is passed without an explicit tzinfo set, it will be assumed to be UTC.
api_access_endpoint	str (Optional) URI base, for instance "https://storage.googleapis.com". If not specified, the client's api_endpoint will be used. Incompatible with bucket_bound_hostname.
method	str The HTTP verb that will be used when requesting the URL.
content_md5	str (Optional) The MD5 hash of the object referenced by resource.
content_type	str (Optional) The content type of the object referenced by resource.
response_disposition	str (Optional) Content disposition of responses to requests for the signed URL. For example, to enable the signed URL to initiate a file of blog.png, use the value 'attachment; filename=blob.png'.
response_type	str (Optional) Content type of responses to requests for the signed URL. Ignored if content_type is set on object/blob metadata.
generation	str (Optional) A value that indicates which generation of the resource to fetch.
headers	dict (Optional) Additional HTTP headers to be included as part of the signed URLs. See: https://cloud.google.com/storage/docs/xml-api/reference-headers Requests using the signed URL must pass the specified header (name and value) with each request for the URL.
query_parameters	dict (Optional) Additional query parameters to be included as part of the signed URLs. See: https://cloud.google.com/storage/docs/xml-api/reference-headers#query
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
credentials	google.auth.credentials.Credentials (Optional) The authorization credentials to attach to requests. These credentials identify this application to the service. If none are specified, the client will attempt to ascertain the credentials from the environment.
version	str (Optional) The version of signed credential to create. Must be one of 'v2' 'v4'.
service_account_email	str (Optional) E-mail address of the service account.
access_token	str (Optional) Access token for a service account.
virtual_hosted_style	bool (Optional) If true, then construct the URL relative the bucket's virtual hostname, e.g., '
bucket_bound_hostname	str (Optional) If passed, then construct the URL relative to the bucket-bound hostname. Value can be a bare or with scheme, e.g., 'example.com' or 'http://example.com'. Incompatible with api_access_endpoint and virtual_hosted_style. 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 the scheme. https will work only when using a CDN. Defaults to "http".

Exceptions
Type	Description
`ValueError	when version is invalid or mutually exclusive arguments are used.
`TypeError	when expiration is not a valid type.
`AttributeError	if credentials is not an instance of google.auth.credentials.Signing.

Returns
Type	Description
str	A signed URL you can use to access the resource until expiration.

get_iam_policy

get_iam_policy(client=None, requested_policy_version=None, timeout=60, retry=<google.api_core.retry.retry_unary.Retry object>)

Retrieve the IAM policy for the object.

Note: Blob- / object-level IAM support does not yet exist and methods currently call an internal ACL backend not providing any utility beyond the blob's acl at this time. The API may be enhanced in the future and is currently undocumented. Use acl for managing object access control.

Parameters
Name	Description
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the current object's bucket.
requested_policy_version	int or NoneType (Optional) The version of IAM policies to request. If a policy with a condition is requested without setting this, the server will return an error. This must be set to a value of 3 to retrieve IAM policies containing conditions. This is to prevent client code that isn't aware of IAM conditions from interpreting and modifying policies incorrectly. The service might return a policy with version lower than the one that was requested, based on the feature syntax in the policy fetched.
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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
google.api_core.iam.Policy	the policy instance, based on the resource returned from the getIamPolicy API request.

make_private

make_private(client=None, timeout=60, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Update blob's ACL, revoking read access for anonymous users.

Parameters
Name	Description
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
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
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

make_public

make_public(client=None, timeout=60, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Update blob's ACL, granting read access to anonymous users.

Parameters
Name	Description
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
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
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

open

open(
    mode="r",
    chunk_size=None,
    ignore_flush=None,
    encoding=None,
    errors=None,
    newline=None,
    **kwargs
)

Create a file handler for file-like I/O to or from this blob.

This method can be used as a context manager, just like Python's built-in 'open()' function.

While reading, as with other read methods, if blob.generation is not set the most recent blob generation will be used. Because the file-like IO reader downloads progressively in chunks, this could result in data from multiple versions being mixed together. If this is a concern, use either bucket.get_blob(), or blob.reload(), which will download the latest generation number and set it; or, if the generation is known, set it manually, for instance with bucket.blob(generation=123456).

Checksumming (hashing) to verify data integrity is disabled for reads using this feature because reads are implemented using request ranges, which do not provide checksums to validate. See https://cloud.google.com/storage/docs/hashes-etags for details.

See a code sample.

Keyword arguments to pass to the underlying API calls. For both uploads and downloads, the following arguments are supported:

• if_generation_match
• if_generation_not_match
• if_metageneration_match
• if_metageneration_not_match
• timeout
• retry

For downloads only, the following additional arguments are supported:

• raw_download

For uploads only, the following additional arguments are supported:

• content_type
• num_retries
• predefined_acl
• checksum

Note: num_retries is supported for backwards-compatibility reasons only; please use retry with a Retry object or ConditionalRetryPolicy instead.

Parameters
Name	Description
mode	str (Optional) A mode string, as per standard Python open() semantics.The first character must be 'r', to open the blob for reading, or 'w' to open it for writing. The second character, if present, must be 't' for (unicode) text mode, or 'b' for bytes mode. If the second character is omitted, text mode is the default.
chunk_size	long (Optional) For reads, the minimum number of bytes to read at a time. If fewer bytes than the chunk_size are requested, the remainder is buffered. For writes, the maximum number of bytes to buffer before sending data to the server, and the size of each request when data is sent. Writes are implemented as a "resumable upload", so chunk_size for writes must be exactly a multiple of 256KiB as with other resumable uploads. The default is 40 MiB.
ignore_flush	bool (Optional) For non text-mode writes, makes flush() do nothing instead of raising an error. flush() without closing is not supported by the remote service and therefore calling it normally results in io.UnsupportedOperation. However, that behavior is incompatible with some consumers and wrappers of file objects in Python, such as zipfile.ZipFile or io.TextIOWrapper. Setting ignore_flush will cause flush() to successfully do nothing, for compatibility with those contexts. The correct way to actually flush data to the remote server is to close() (using a context manager, such as in the example, will cause this to happen automatically).
encoding	str (Optional) For text mode only, the name of the encoding that the stream will be decoded or encoded with. If omitted, it defaults to locale.getpreferredencoding(False).
errors	str (Optional) For text mode only, an optional string that specifies how encoding and decoding errors are to be handled. Pass 'strict' to raise a ValueError exception if there is an encoding error (the default of None has the same effect), or pass 'ignore' to ignore errors. (Note that ignoring encoding errors can lead to data loss.) Other more rarely-used options are also available; see the Python 'io' module documentation for 'io.TextIOWrapper' for a complete list.
newline	str (Optional) For text mode only, controls how line endings are handled. It can be None, '', '\n', '\r', and '\r\n'. If None, reads use "universal newline mode" and writes use the system default. See the Python 'io' module documentation for 'io.TextIOWrapper' for details.

patch

patch(client=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>, override_unlocked_retention=False)

Sends all changed properties in a PATCH request.

Updates the _properties with the response from the backend.

If user_project is set, bills the API request to that project.

Parameters
Name	Description
client	Client or NoneType the client to use. If not passed, falls back to the client stored on the current object.
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	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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries
override_unlocked_retention	bool (Optional) override_unlocked_retention must be set to True if the operation includes a retention property that changes the mode from Unlocked to Locked, reduces the retainUntilTime, or removes the retention configuration from the object. See: https://cloud.google.com/storage/docs/json_api/v1/objects/patch

path_helper

path_helper(bucket_path, blob_name)

Relative URL path for a blob.

Parameters
Name	Description
bucket_path	str The URL path for a bucket.
blob_name	str The name of the blob.

Returns
Type	Description
str	The relative URL path for blob_name.

reload

reload(client=None, projection='noAcl', 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, retry=<google.api_core.retry.retry_unary.Retry object>)

Reload properties from Cloud Storage.

If user_project is set, bills the API request to that project.

Parameters
Name	Description
client	Client or NoneType the client to use. If not passed, falls back to the client stored on the current object.
projection	str (Optional) If used, must be 'full' or 'noAcl'. Defaults to 'noAcl'. Specifies the set of properties to return.
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	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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

rewrite

rewrite(source, token=None, client=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, if_source_generation_match=None, if_source_generation_not_match=None, if_source_metageneration_match=None, if_source_metageneration_not_match=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Rewrite source blob into this one.

If user_project is set on the bucket, bills the API request to that project.

Note: rewrite is not supported in a Batch context.

Parameters
Name	Description
source	Blob blob whose contents will be rewritten into this blob.
token	str (Optional) Token returned from an earlier, not-completed call to rewrite the same source blob. If passed, result will include updated status, total bytes written.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
if_generation_match	long (Optional) See :ref:using-if-generation-match Note that the generation to be matched is that of the destination blob.
if_generation_not_match	long (Optional) See :ref:using-if-generation-not-match Note that the generation to be matched is that of the destination blob.
if_metageneration_match	long (Optional) See :ref:using-if-metageneration-match Note that the metageneration to be matched is that of the destination blob.
if_metageneration_not_match	long (Optional) See :ref:using-if-metageneration-not-match Note that the metageneration to be matched is that of the destination blob.
if_source_generation_match	long (Optional) Makes the operation conditional on whether the source object's generation matches the given value.
if_source_generation_not_match	long (Optional) Makes the operation conditional on whether the source object's generation does not match the given value.
if_source_metageneration_match	long (Optional) Makes the operation conditional on whether the source object's current metageneration matches the given value.
if_source_metageneration_not_match	long (Optional) Makes the operation conditional on whether the source object's current metageneration does not match the given value.
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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
tuple	(token, bytes_rewritten, total_bytes), where token is a rewrite token (None if the rewrite is complete), bytes_rewritten is the number of bytes rewritten so far, and total_bytes is the total number of bytes to be rewritten.

set_iam_policy

set_iam_policy(policy, client=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Update the IAM policy for the bucket.

Note: Blob- / object-level IAM support does not yet exist and methods currently call an internal ACL backend not providing any utility beyond the blob's acl at this time. The API may be enhanced in the future and is currently undocumented. Use acl for managing object access control.

Parameters
Name	Description
policy	google.api_core.iam.Policy policy instance used to update bucket's IAM policy.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
google.api_core.iam.Policy	the policy instance, based on the resource returned from the setIamPolicy API request.

test_iam_permissions

test_iam_permissions(permissions, client=None, timeout=60, retry=<google.api_core.retry.retry_unary.Retry object>)

API call: test permissions

Note: Blob- / object-level IAM support does not yet exist and methods currently call an internal ACL backend not providing any utility beyond the blob's acl at this time. The API may be enhanced in the future and is currently undocumented. Use acl for managing object access control.

Parameters
Name	Description
permissions	list of string the permissions to check
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
list of string	the permissions returned by the testIamPermissions API request.

update

update(client=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>, override_unlocked_retention=False)

Sends all properties in a PUT request.

Updates the _properties with the response from the backend.

If user_project is set, bills the API request to that project.

Parameters
Name	Description
client	Client or NoneType the client to use. If not passed, falls back to the client stored on the current object.
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	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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries
override_unlocked_retention	bool (Optional) override_unlocked_retention must be set to True if the operation includes a retention property that changes the mode from Unlocked to Locked, reduces the retainUntilTime, or removes the retention configuration from the object. See: https://cloud.google.com/storage/docs/json_api/v1/objects/patch

update_storage_class

update_storage_class(new_class, client=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, if_source_generation_match=None, if_source_generation_not_match=None, if_source_metageneration_match=None, if_source_metageneration_not_match=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Update blob's storage class via a rewrite-in-place. This helper will wait for the rewrite to complete before returning, so it may take some time for large files.

See https://cloud.google.com/storage/docs/per-object-storage-class

If user_project is set on the bucket, bills the API request to that project.

Parameters
Name	Description
new_class	str new storage class for the object. One of: NEARLINE_STORAGE_CLASS, COLDLINE_STORAGE_CLASS, ARCHIVE_STORAGE_CLASS, STANDARD_STORAGE_CLASS, MULTI_REGIONAL_LEGACY_STORAGE_CLASS, or REGIONAL_LEGACY_STORAGE_CLASS.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
if_generation_match	long (Optional) See :ref:using-if-generation-match Note that the generation to be matched is that of the destination blob.
if_generation_not_match	long (Optional) See :ref:using-if-generation-not-match Note that the generation to be matched is that of the destination blob.
if_metageneration_match	long (Optional) See :ref:using-if-metageneration-match Note that the metageneration to be matched is that of the destination blob.
if_metageneration_not_match	long (Optional) See :ref:using-if-metageneration-not-match Note that the metageneration to be matched is that of the destination blob.
if_source_generation_match	long (Optional) Makes the operation conditional on whether the source object's generation matches the given value.
if_source_generation_not_match	long (Optional) Makes the operation conditional on whether the source object's generation does not match the given value.
if_source_metageneration_match	long (Optional) Makes the operation conditional on whether the source object's current metageneration matches the given value.
if_source_metageneration_not_match	long (Optional) Makes the operation conditional on whether the source object's current metageneration does not match the given value.
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 or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

upload_from_file

upload_from_file(file_obj, rewind=False, size=None, content_type=None, num_retries=None, client=None, predefined_acl=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=60, checksum=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Upload the contents of this blob from a file-like object.

The content type of the upload will be determined in order of precedence:

• The value passed in to this method (if not :data:None)
• The value stored on the current blob
• The default value ('application/octet-stream')

Note: The effect of uploading to an existing blob depends on the "versioning" and "lifecycle" policies defined on the blob's bucket. In the absence of those policies, upload will overwrite any existing contents.

See the object versioning and lifecycle API documents for details.

If the size of the data to be uploaded exceeds 8 MB a resumable media request will be used, otherwise the content and the metadata will be uploaded in a single multipart upload request.

For more fine-grained over the upload process, check out google-resumable-media.

If user_project is set on the bucket, bills the API request to that project.

Parameters
Name	Description
file_obj	file A file handle opened in binary mode for reading.
rewind	bool If True, seek to the beginning of the file handle before writing the file to Cloud Storage.
size	int The number of bytes to be uploaded (which will be read from file_obj). If not provided, the upload will be concluded once file_obj is exhausted.
content_type	str (Optional) Type of content being uploaded.
num_retries	int Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.)
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
predefined_acl	str (Optional) Predefined access control list
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	float or tuple (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. If the upload is completed in a single request, the checksum will be entirely precomputed and the remote server will handle verification and error handling. If the upload is too large and must be transmitted in multiple requests, the checksum will be incrementally computed and the client will handle verification and error handling, raising google.resumable_media.common.DataCorruption on a mismatch and attempting to delete the corrupted file. Supported values are "md5", "crc32c" and None. The default is None.
retry	google.api_core.retry.Retry or google.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. A google.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_generation_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.

Exceptions
Type	Description
GoogleCloudError	if the upload response returns an error status.

upload_from_filename

upload_from_filename(filename, content_type=None, num_retries=None, client=None, predefined_acl=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=60, checksum=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Upload this blob's contents from the content of a named file.

The content type of the upload will be determined in order of precedence:

• The value passed in to this method (if not :data:None)
• The value stored on the current blob
• The value given by mimetypes.guess_type
• The default value ('application/octet-stream')

Note: The effect of uploading to an existing blob depends on the "versioning" and "lifecycle" policies defined on the blob's bucket. In the absence of those policies, upload will overwrite any existing contents.

See the object versioning and lifecycle API documents for details.

If user_project is set on the bucket, bills the API request to that project.

See a code sample to upload a file with a customer-supplied encryption key.

Parameters
Name	Description
filename	str The path to the file.
content_type	str (Optional) Type of content being uploaded.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
num_retries	int Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.)
predefined_acl	str (Optional) Predefined access control list
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	float or tuple (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. If the upload is completed in a single request, the checksum will be entirely precomputed and the remote server will handle verification and error handling. If the upload is too large and must be transmitted in multiple requests, the checksum will be incrementally computed and the client will handle verification and error handling, raising google.resumable_media.common.DataCorruption on a mismatch and attempting to delete the corrupted file. Supported values are "md5", "crc32c" and None. The default is None.
retry	google.api_core.retry.Retry or google.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. A google.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_generation_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.

upload_from_string

upload_from_string(data, content_type='text/plain', num_retries=None, client=None, predefined_acl=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=60, checksum=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Upload contents of this blob from the provided string.

Note: The effect of uploading to an existing blob depends on the "versioning" and "lifecycle" policies defined on the blob's bucket. In the absence of those policies, upload will overwrite any existing contents.

See the object versioning and lifecycle API documents for details.

If user_project is set on the bucket, bills the API request to that project.

Parameters
Name	Description
data	bytes or str The data to store in this blob. If the value is text, it will be encoded as UTF-8.
content_type	str (Optional) Type of content being uploaded. Defaults to 'text/plain'.
num_retries	int Number of upload retries. By default, only uploads with if_generation_match set will be retried, as uploads without the argument are not guaranteed to be idempotent. Setting num_retries will override this default behavior and guarantee retries even when if_generation_match is not set. (Deprecated: This argument will be removed in a future release.)
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
predefined_acl	str (Optional) Predefined access control list
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	float or tuple (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. If the upload is completed in a single request, the checksum will be entirely precomputed and the remote server will handle verification and error handling. If the upload is too large and must be transmitted in multiple requests, the checksum will be incrementally computed and the client will handle verification and error handling, raising google.resumable_media.common.DataCorruption on a mismatch and attempting to delete the corrupted file. Supported values are "md5", "crc32c" and None. The default is None.
retry	google.api_core.retry.Retry or google.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. A google.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_generation_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.