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---
title: TrotterizationBase
description: API reference for qiskit.opflow.evolutions.TrotterizationBase
in_page_toc_min_heading_level: 1
python_api_type: class
python_api_name: qiskit.opflow.evolutions.TrotterizationBase
---
# TrotterizationBase
<Class id="qiskit.opflow.evolutions.TrotterizationBase" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.25/qiskit/opflow/evolutions/trotterizations/trotterization_base.py" signature="qiskit.opflow.evolutions.TrotterizationBase(reps=1)" modifiers="class">
Bases: [`EvolutionBase`](qiskit.opflow.evolutions.EvolutionBase "qiskit.opflow.evolutions.evolution_base.EvolutionBase")
Deprecated: A base for Trotterization methods, algorithms for approximating exponentiations of operator sums by compositions of exponentiations.
<Admonition title="Deprecated since version 0.24.0" type="danger">
The class `qiskit.opflow.evolutions.trotterizations.trotterization_base.TrotterizationBase` 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).
</Admonition>
## Attributes
### reps
<Attribute id="qiskit.opflow.evolutions.TrotterizationBase.reps">
The number of repetitions to use in the Trotterization, improving the approximation accuracy.
</Attribute>
## Methods
### convert
<Function id="qiskit.opflow.evolutions.TrotterizationBase.convert" signature="convert(operator)" modifiers="abstract">
Convert a `SummedOp` into a `ComposedOp` or `CircuitOp` representing an approximation of e^-i\*\`\`op\_sum\`\`.
**Parameters**
**operator** ([*OperatorBase*](qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")) The `SummedOp` to evolve.
**Returns**
The Operator approximating op\_sums evolution.
**Raises**
[**TypeError**](https://docs.python.org/3/library/exceptions.html#TypeError "(in Python v3.12)") A non-SummedOps Operator is passed into `convert`.
**Return type**
[*OperatorBase*](qiskit.opflow.OperatorBase "qiskit.opflow.operator_base.OperatorBase")
</Function>
</Class>