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---
title: EvolutionFactory
description: API reference for qiskit.aqua.operators.evolutions.EvolutionFactory
in_page_toc_min_heading_level: 1
python_api_type: class
python_api_name: qiskit.aqua.operators.evolutions.EvolutionFactory
---
# EvolutionFactory
<Class id="qiskit.aqua.operators.evolutions.EvolutionFactory" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-aqua/tree/stable/0.9/qiskit/aqua/operators/evolutions/evolution_factory.py" signature="EvolutionFactory" modifiers="class">
Bases: `object`
A factory class for convenient automatic selection of an Evolution algorithm based on the Operator to be converted.
## Methods
### build
<Function id="qiskit.aqua.operators.evolutions.EvolutionFactory.build" signature="EvolutionFactory.build(operator=None)" modifiers="static">
A factory method for convenient automatic selection of an Evolution algorithm based on the Operator to be converted.
**Parameters**
**operator** (`Optional`\[`OperatorBase`]) the Operator being evolved
**Returns**
the `EvolutionBase` best suited to evolve operator.
**Return type**
[EvolutionBase](qiskit.aqua.operators.evolutions.EvolutionBase "qiskit.aqua.operators.evolutions.EvolutionBase")
**Raises**
**ValueError** If operator is not of a composition for which we know the best Evolution method.
</Function>
</Class>