CloudTasksClient(
transport=None,
channel=None,
credentials=None,
client_config=None,
client_info=None,
client_options=None,
)
Cloud Tasks allows developers to manage the execution of background work in their applications.
Methods
CloudTasksClient
CloudTasksClient(
transport=None,
channel=None,
credentials=None,
client_config=None,
client_info=None,
client_options=None,
)
Constructor.
Name | Description |
channel |
grpc.Channel
DEPRECATED. A |
credentials |
google.auth.credentials.Credentials
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. This argument is mutually exclusive with providing a transport instance to |
client_config |
dict
DEPRECATED. A dictionary of call options for each method. If not specified, the default configuration is used. |
client_info |
google.api_core.gapic_v1.client_info.ClientInfo
The client info used to send a user-agent string along with API requests. If |
client_options |
Union[dict, google.api_core.client_options.ClientOptions]
Client options used to set user options on the client. API Endpoint should be set through client_options. |
create_queue
create_queue(parent, queue, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Creates a queue.
Queues created with this method allow tasks to live for a maximum of 31 days. After a task is 31 days old, the task will be deleted regardless of whether it was dispatched or not.
WARNING: Using this method may have unintended side effects if you are
using an App Engine queue.yaml
or queue.xml
file to manage your
queues. Read Overview of Queue Management and
queue.yaml <https://cloud.google.com/tasks/docs/queue-yaml>
__ before
using this method.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
parent = client.location_path('[PROJECT]', '[LOCATION]')
Initialize
queue
:queue = { ... # The fully qualified path to the queue ... 'name': client.queue_path('[PROJECT]', '[LOCATION]', '[NAME]'), ... 'app_engine_http_queue': { ... 'app_engine_routing_override': { ... # The App Engine service that will receive the tasks. ... 'service': 'default', ... }, ... }, ... }
response = client.create_queue(parent, queue)
Name | Description |
parent |
str
Required. The location name in which the queue will be created. For example: |
queue |
Union[dict, Queue]
Required. The queue to create. |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
create_task
create_task(parent, task, response_view=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Creates a task and adds it to a queue.
Tasks cannot be updated after creation; there is no UpdateTask command.
- The maximum task size is 100KB.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
parent = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
TODO: Initialize
task
:task = {}
response = client.create_task(parent, task)
Name | Description |
parent |
str
Required. The queue name. For example: |
task |
Union[dict, Task]
Required. The task to add. Task names have the following format: |
response_view |
View
The response_view specifies which subset of the |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
delete_queue
delete_queue(name, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Deletes a queue.
This command will delete the queue even if it has tasks in it.
Note: If you delete a queue, a queue with the same name can't be created for 7 days.
WARNING: Using this method may have unintended side effects if you are
using an App Engine queue.yaml
or queue.xml
file to manage your
queues. Read Overview of Queue Management and
queue.yaml <https://cloud.google.com/tasks/docs/queue-yaml>
__ before
using this method.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
name = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
client.delete_queue(name)
Name | Description |
name |
str
Required. The queue name. For example: |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
delete_task
delete_task(name, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Deletes a task.
A task can be deleted if it is scheduled or dispatched. A task cannot be deleted if it has executed successfully or permanently failed.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
name = client.task_path('[PROJECT]', '[LOCATION]', '[QUEUE]', '[TASK]')
client.delete_task(name)
Name | Description |
name |
str
Required. The task name. For example: |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
from_service_account_file
from_service_account_file(filename, *args, **kwargs)
Creates an instance of this client using the provided credentials file.
Name | Description |
filename |
str
The path to the service account private key json file. |
Type | Description |
CloudTasksClient | The constructed client. |
from_service_account_json
from_service_account_json(filename, *args, **kwargs)
Creates an instance of this client using the provided credentials file.
Name | Description |
filename |
str
The path to the service account private key json file. |
Type | Description |
CloudTasksClient | The constructed client. |
get_iam_policy
get_iam_policy(resource, options_=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Gets the access control policy for a Queue
. Returns an empty policy
if the resource exists and does not have a policy set.
Authorization requires the following Google
IAM <https://cloud.google.com/iam>
__ permission on the specified
resource parent:
cloudtasks.queues.getIamPolicy
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
resource = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
response = client.get_iam_policy(resource)
Name | Description |
resource |
str
REQUIRED: The resource for which the policy is being requested. See the operation documentation for the appropriate value for this field. |
options_ |
Union[dict, GetPolicyOptions]
OPTIONAL: A |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
get_queue
get_queue(name, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Gets a queue.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
name = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
response = client.get_queue(name)
Name | Description |
name |
str
Required. The resource name of the queue. For example: |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
get_task
get_task(name, response_view=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Gets a task.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
name = client.task_path('[PROJECT]', '[LOCATION]', '[QUEUE]', '[TASK]')
response = client.get_task(name)
Name | Description |
name |
str
Required. The task name. For example: |
response_view |
View
The response_view specifies which subset of the |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
list_queues
list_queues(parent, filter_=None, page_size=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Lists queues.
Queues are returned in lexicographical order.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
parent = client.location_path('[PROJECT]', '[LOCATION]')
Iterate over all results
for element in client.list_queues(parent): ... # process element ... pass
Alternatively:
Iterate over results one page at a time
for page in client.list_queues(parent).pages: ... for element in page: ... # process element ... pass
Name | Description |
parent |
str
Required. The location name. For example: |
filter_ |
str
|
page_size |
int
The maximum number of resources contained in the underlying API response. If page streaming is performed per- resource, this parameter does not affect the return value. If page streaming is performed per-page, this determines the maximum number of resources in a page. |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
list_tasks
list_tasks(parent, response_view=None, page_size=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Lists the tasks in a queue.
By default, only the BASIC
view is retrieved due to performance
considerations; response_view
controls the subset of information
which is returned.
The tasks may be returned in any order. The ordering may change at any time.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
parent = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
Iterate over all results
for element in client.list_tasks(parent): ... # process element ... pass
Alternatively:
Iterate over results one page at a time
for page in client.list_tasks(parent).pages: ... for element in page: ... # process element ... pass
Name | Description |
parent |
str
Required. The queue name. For example: |
response_view |
View
The response_view specifies which subset of the |
page_size |
int
The maximum number of resources contained in the underlying API response. If page streaming is performed per- resource, this parameter does not affect the return value. If page streaming is performed per-page, this determines the maximum number of resources in a page. |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
location_path
location_path(project, location)
Return a fully-qualified location string.
pause_queue
pause_queue(name, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Pauses the queue.
If a queue is paused then the system will stop dispatching tasks until
the queue is resumed via ResumeQueue
. Tasks can still be added when
the queue is paused. A queue is paused if its state
is PAUSED
.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
name = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
response = client.pause_queue(name)
Name | Description |
name |
str
Required. The queue name. For example: |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
project_path
project_path(project)
Return a fully-qualified project string.
purge_queue
purge_queue(name, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Purges a queue by deleting all of its tasks.
All tasks created before this method is called are permanently deleted.
Purge operations can take up to one minute to take effect. Tasks might be dispatched before the purge takes effect. A purge is irreversible.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
name = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
response = client.purge_queue(name)
Name | Description |
name |
str
Required. The queue name. For example: |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
queue_path
queue_path(project, location, queue)
Return a fully-qualified queue string.
resume_queue
resume_queue(name, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Resume a queue.
This method resumes a queue after it has been PAUSED
or
DISABLED
. The state of a queue is stored in the queue's state
;
after calling this method it will be set to RUNNING
.
WARNING: Resuming many high-QPS queues at the same time can lead to
target overloading. If you are resuming high-QPS queues, follow the
500/50/5 pattern described in Managing Cloud Tasks Scaling
Risks <https://cloud.google.com/tasks/docs/manage-cloud-task-scaling>
__.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
name = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
response = client.resume_queue(name)
Name | Description |
name |
str
Required. The queue name. For example: |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
run_task
run_task(name, response_view=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Forces a task to run now.
When this method is called, Cloud Tasks will dispatch the task, even if
the task is already running, the queue has reached its RateLimits
or
is PAUSED
.
This command is meant to be used for manual debugging. For example,
RunTask
can be used to retry a failed task after a fix has been made
or to manually force a task to be dispatched now.
The dispatched task is returned. That is, the task that is returned
contains the status
after the task is dispatched but before the task
is received by its target.
If Cloud Tasks receives a successful response from the task's target,
then the task will be deleted; otherwise the task's schedule_time
will be reset to the time that RunTask
was called plus the retry
delay specified in the queue's RetryConfig
.
RunTask
returns NOT_FOUND
when it is called on a task that has
already succeeded or permanently failed.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
name = client.task_path('[PROJECT]', '[LOCATION]', '[QUEUE]', '[TASK]')
response = client.run_task(name)
Name | Description |
name |
str
Required. The task name. For example: |
response_view |
View
The response_view specifies which subset of the |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
set_iam_policy
set_iam_policy(resource, policy, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Sets the access control policy for a Queue
. Replaces any existing
policy.
Note: The Cloud Console does not check queue-level IAM permissions yet. Project-level permissions are required to use the Cloud Console.
Authorization requires the following Google
IAM <https://cloud.google.com/iam>
__ permission on the specified
resource parent:
cloudtasks.queues.setIamPolicy
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
resource = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
TODO: Initialize
policy
:policy = {}
response = client.set_iam_policy(resource, policy)
Name | Description |
resource |
str
REQUIRED: The resource for which the policy is being specified. See the operation documentation for the appropriate value for this field. |
policy |
Union[dict, Policy]
REQUIRED: The complete policy to be applied to the |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
task_path
task_path(project, location, queue, task)
Return a fully-qualified task string.
test_iam_permissions
test_iam_permissions(resource, permissions, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Returns permissions that a caller has on a Queue
. If the resource
does not exist, this will return an empty set of permissions, not a
NOT_FOUND
error.
Note: This operation is designed to be used for building permission-aware UIs and command-line tools, not for authorization checking. This operation may "fail open" without warning.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
resource = client.queue_path('[PROJECT]', '[LOCATION]', '[QUEUE]')
TODO: Initialize
permissions
:permissions = []
response = client.test_iam_permissions(resource, permissions)
Name | Description |
resource |
str
REQUIRED: The resource for which the policy detail is being requested. See the operation documentation for the appropriate value for this field. |
permissions |
list[str]
The set of permissions to check for the |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |
update_queue
update_queue(queue, update_mask=None, retry=<_MethodDefault._DEFAULT_VALUE: <object object>>, timeout=<_MethodDefault._DEFAULT_VALUE: <object object>>, metadata=None)
Updates a queue.
This method creates the queue if it does not exist and updates the queue if it does exist.
Queues created with this method allow tasks to live for a maximum of 31 days. After a task is 31 days old, the task will be deleted regardless of whether it was dispatched or not.
WARNING: Using this method may have unintended side effects if you are
using an App Engine queue.yaml
or queue.xml
file to manage your
queues. Read Overview of Queue Management and
queue.yaml <https://cloud.google.com/tasks/docs/queue-yaml>
__ before
using this method.
.. rubric:: Example
from google.cloud import tasks_v2beta3
client = tasks_v2beta3.CloudTasksClient()
Initialize
queue
:queue = { ... # The fully qualified path to the queue ... 'name': client.queue_path('[PROJECT]', '[LOCATION]', '[NAME]'), ... 'app_engine_http_queue': { ... 'app_engine_routing_override': { ... # The App Engine service that will receive the tasks. ... 'service': 'default', ... }, ... }, ... }
response = client.update_queue(queue)
Name | Description |
queue |
Union[dict, Queue]
Required. The queue to create or update. The queue's |
update_mask |
Union[dict, FieldMask]
A mask used to specify which fields of the queue are being updated. If empty, then all fields will be updated. If a dict is provided, it must be of the same form as the protobuf message FieldMask |
retry |
Optional[google.api_core.retry.Retry]
A retry object used to retry requests. If |
timeout |
Optional[float]
The amount of time, in seconds, to wait for the request to complete. Note that if |
metadata |
Optional[Sequence[Tuple[str, str]]]
Additional metadata that is provided to the method. |
Type | Description |
google.api_core.exceptions.GoogleAPICallError | If the request failed for any reason. |
google.api_core.exceptions.RetryError | If the request failed due to a retryable error and retry attempts failed. |
ValueError | If the parameters are invalid. |