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Python client library | Google Cloud

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Bases: object

An Aggregation query against the Cloud Datastore.

This class serves as an abstraction for creating aggregations over query in the Cloud Datastore.

• Parameters

  • client (google.cloud.datastore.client.Client) – The client used to connect to Datastore.

  • query (google.cloud.datastore.query.Query) – The query used for aggregations.

Adds an aggregation operation to the nested query

• Parameters

  aggregation (google.cloud.datastore.aggregation.BaseAggregation) – An aggregation operation, e.g. a CountAggregation

Adds a list of aggregations to the nested query :type aggregations: list :param aggregations: a list of aggregation operations

Adds a count over the nested query

• Parameters

  alias (str) – (Optional) The alias for the count

Execute the Aggregation Query; return an iterator for the aggregation results.

For example:

>>> andy = datastore.Entity(client.key('Person', 1234))
>>> andy['name'] = 'Andy'
>>> sally = datastore.Entity(client.key('Person', 2345))
>>> sally['name'] = 'Sally'
>>> bobby = datastore.Entity(client.key('Person', 3456))
>>> bobby['name'] = 'Bobby'
>>> client.put_multi([andy, sally, bobby])
>>> query = client.query(kind='Andy')
>>> aggregation_query = client.aggregation_query(query)
>>> result = aggregation_query.count(alias="total").fetch(limit=5)
>>> result
<google.cloud.datastore.aggregation.AggregationResultIterator object at ...>

• Parameters

  • client (google.cloud.datastore.client.Client) – (Optional) client used to connect to datastore. If not supplied, uses the query’s value.

  • eventual (bool) – (Optional) Defaults to strongly consistent (False). Setting True will use eventual consistency, but cannot be used inside a transaction or with read_time, otherwise will raise ValueError.

  • retry (google.api_core.retry.Retry) – A retry object used to retry requests. If None is specified, requests will be retried using a default configuration.

  • timeout (float) – Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt.

  • read_time (datetime) – (Optional) use read_time read consistency, cannot be used inside a transaction or with eventual consistency, or will raise ValueError.

• Return type

  AggregationIterator

• Returns

  The iterator for the aggregation query.

The nested query’s namespace

• Return type

  str or None

• Returns

  the namespace assigned to this query

Get the project for this AggregationQuery.

• Return type

  str

• Returns

  The project for the query.

Bases: object

A class representing result from Aggregation Query

• Parameters

  • alias (str) – The alias for the aggregation.

  • value (int) – The resulting value from the aggregation.

Bases: google.api_core.page_iterator.Iterator

Represent the state of a given execution of a Query.

• Parameters

  • aggregation_query (AggregationQuery) – AggregationQuery object holding permanent configuration (i.e. things that don’t change on with each page in a results set).

  • client (Client) – The client used to make a request.

  • eventual (bool) – (Optional) Defaults to strongly consistent (False). Setting True will use eventual consistency, but cannot be used inside a transaction or with read_time, otherwise will raise ValueError.

  • retry (google.api_core.retry.Retry) – A retry object used to retry requests. If None is specified, requests will be retried using a default configuration.

  • timeout (float) – Time, in seconds, to wait for the request to complete. Note that if retry is specified, the timeout applies to each individual attempt.

  • read_time (datetime) – (Optional) Runs the query with read time consistency. Cannot be used with eventual consistency or inside a transaction, otherwise will raise ValueError. This feature is in private preview.

Bases: abc.ABC

Base class representing an Aggregation operation in Datastore

Bases: google.cloud.datastore.aggregation.BaseAggregation

Representation of a “Count” aggregation query.

• Parameters

  • alias (str) – The alias for the aggregation.

  • value (int) – The resulting value from the aggregation.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

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