47 lines
1.8 KiB
Plaintext
47 lines
1.8 KiB
Plaintext
---
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title: EvolutionFactory
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description: API reference for qiskit.opflow.evolutions.EvolutionFactory
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in_page_toc_min_heading_level: 1
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python_api_type: class
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python_api_name: qiskit.opflow.evolutions.EvolutionFactory
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---
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# EvolutionFactory
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<Class id="qiskit.opflow.evolutions.EvolutionFactory" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.24/qiskit/opflow/evolutions/evolution_factory.py" signature="EvolutionFactory" modifiers="class">
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Bases: `object`
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Deprecated: A factory class for convenient automatic selection of an Evolution algorithm based on the Operator to be converted.
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## Methods Defined Here
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<span id="qiskit-opflow-evolutions-evolutionfactory-build" />
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### build
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<Function id="qiskit.opflow.evolutions.EvolutionFactory.build" signature="EvolutionFactory.build(operator=None)" modifiers="static">
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A factory method for convenient automatic selection of an Evolution algorithm based on the Operator to be converted.
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<Admonition title="Deprecated since version 0.24.0" type="danger">
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The method `qiskit.opflow.evolutions.evolution_factory.EvolutionFactory.build()` is deprecated as of qiskit-terra 0.24.0. It will be removed no earlier than 3 months after the release date. For code migration guidelines, visit [https://qisk.it/opflow\_migration](https://qisk.it/opflow_migration).
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</Admonition>
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**Parameters**
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**operator** ([*OperatorBase*](qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")) – the Operator being evolved
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**Returns**
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the `EvolutionBase` best suited to evolve operator.
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**Return type**
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[EvolutionBase](qiskit.opflow.evolutions.EvolutionBase "qiskit.opflow.evolutions.EvolutionBase")
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**Raises**
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**ValueError** – If operator is not of a composition for which we know the best Evolution method.
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</Function>
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</Class>
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