---
title: DAGOpNode (v1.2)
description: API reference for qiskit.dagcircuit.DAGOpNode in qiskit v1.2
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/1.2/qiskit.dagcircuit.DAGOpNode
---

# DAGOpNode

*class* `qiskit.dagcircuit.DAGOpNode`

Bases: [`DAGNode`](/docs/api/qiskit/1.2/qiskit.dagcircuit.DAGNode "qiskit._accelerate.circuit.DAGNode")

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

## Attributes

### cargs

### condition

### definition

### duration

### label

### matrix

### name

Returns the Instruction name corresponding to the op for this node

### num\_clbits

### num\_qubits

### op

### params

### qargs

### sort\_key

### unit

## Methods

### from\_instruction

*static* `from_instruction(instruction, /, *, dag=None, deepcopy=False)`

### is\_control\_flow

`is_control_flow()`

Is the [`Operation`](/docs/api/qiskit/1.2/qiskit.circuit.Operation "qiskit.circuit.Operation") contained in this node a control-flow operation (i.e. an instance of [`ControlFlowOp`](/docs/api/qiskit/1.2/qiskit.circuit.ControlFlowOp "qiskit.circuit.ControlFlowOp"))?

### is\_controlled\_gate

`is_controlled_gate()`

Is the [`Operation`](/docs/api/qiskit/1.2/qiskit.circuit.Operation "qiskit.circuit.Operation") contained in this node a subclass of [`ControlledGate`](/docs/api/qiskit/1.2/qiskit.circuit.ControlledGate "qiskit.circuit.ControlledGate")?

### is\_directive

`is_directive()`

Is the [`Operation`](/docs/api/qiskit/1.2/qiskit.circuit.Operation "qiskit.circuit.Operation") contained in this node a directive?

### is\_parameterized

`is_parameterized()`

Does this node contain any [`ParameterExpression`](/docs/api/qiskit/1.2/qiskit.circuit.ParameterExpression "qiskit.circuit.ParameterExpression") parameters?

### is\_standard\_gate

`is_standard_gate()`

Is the [`Operation`](/docs/api/qiskit/1.2/qiskit.circuit.Operation "qiskit.circuit.Operation") contained in this node a Qiskit standard gate?

### semantic\_eq

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

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.2/qiskit/dagcircuit/dagnode.py#L181-L237)

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/1.2/qiskit.dagcircuit.DAGInNode "qiskit.dagcircuit.DAGInNode")*,* [*DAGOutNode*](/docs/api/qiskit/1.2/qiskit.dagcircuit.DAGOutNode "qiskit.dagcircuit.DAGOutNode")) – A node to compare.
- **node2** ([*DAGOpNode*](#qiskit.dagcircuit.DAGOpNode "qiskit.dagcircuit.DAGOpNode")*,* [*DAGInNode*](/docs/api/qiskit/1.2/qiskit.dagcircuit.DAGInNode "qiskit.dagcircuit.DAGInNode")*,* [*DAGOutNode*](/docs/api/qiskit/1.2/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/1.2/circuit_classical#qiskit.circuit.classical.types.Bool "qiskit.circuit.classical.types.Bool")