---
title: DAGOpNode (v0.46)
description: API reference for qiskit.dagcircuit.DAGOpNode in qiskit v0.46
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/0.46/qiskit.dagcircuit.DAGOpNode
---

# DAGOpNode

*class* `qiskit.dagcircuit.DAGOpNode(op, qargs=(), cargs=(), dag=None)`

[GitHub](https://github.com/qiskit/qiskit/tree/stable/0.46/qiskit/dagcircuit/dagnode.py)

Bases: [`DAGNode`](/docs/api/qiskit/0.46/qiskit.dagcircuit.DAGNode "qiskit.dagcircuit.dagnode.DAGNode")

Object to represent an Instruction at a node in the DAGCircuit.

Create an Instruction node

## Attributes

### op

### qargs

### cargs

### sort\_key

### name

Returns the Instruction name corresponding to the op for this node

## Methods

### semantic\_eq

*static* `semantic_eq(node1, node2, bit_indices1, bit_indices2)`

Check if DAG nodes are considered equivalent, e.g., as a node\_match for [`rustworkx.is_isomorphic_node_match()`](https://www.rustworkx.org/apiref/rustworkx.is_isomorphic_node_match.html#rustworkx.is_isomorphic_node_match).

**Parameters**

- **node1** ([*DAGOpNode*](#qiskit.dagcircuit.DAGOpNode "qiskit.dagcircuit.DAGOpNode")*,* [*DAGInNode*](/docs/api/qiskit/0.46/qiskit.dagcircuit.DAGInNode "qiskit.dagcircuit.DAGInNode")*,* [*DAGOutNode*](/docs/api/qiskit/0.46/qiskit.dagcircuit.DAGOutNode "qiskit.dagcircuit.DAGOutNode")) – A node to compare.
- **node2** ([*DAGOpNode*](#qiskit.dagcircuit.DAGOpNode "qiskit.dagcircuit.DAGOpNode")*,* [*DAGInNode*](/docs/api/qiskit/0.46/qiskit.dagcircuit.DAGInNode "qiskit.dagcircuit.DAGInNode")*,* [*DAGOutNode*](/docs/api/qiskit/0.46/qiskit.dagcircuit.DAGOutNode "qiskit.dagcircuit.DAGOutNode")) – The other node to compare.
- **bit\_indices1** ([*dict*](https://docs.python.org/3/library/stdtypes.html#dict)) – Dictionary mapping Bit instances to their index within the circuit containing node1
- **bit\_indices2** ([*dict*](https://docs.python.org/3/library/stdtypes.html#dict)) – Dictionary mapping Bit instances to their index within the circuit containing node2

**Returns**

If node1 == node2

**Return type**

[Bool](/docs/api/qiskit/0.46/circuit_classical#qiskit.circuit.classical.types.Bool "qiskit.circuit.classical.types.Bool")