---
title: DanglerMatch (latest version)
description: API reference for samplomatic.pre_samplex.DanglerMatch in the latest version of samplomatic
source: https://quantum.cloud.ibm.com/docs/en/api/samplomatic/auto/pre-samplex-dangler-match
---

# DanglerMatch

*class* `samplomatic.pre_samplex.DanglerMatch(direction: Direction | None = None, node_types: tuple[type[PreNode], ...] | None = None, dangler_type: DanglerType | None = None)`

[GitHub](https://github.com/Qiskit/samplomatic/tree/main/samplomatic/pre_samplex/pre_samplex.py#L244-L268)

Bases: [`object`](https://docs.python.org/3/builtins/functions.html#object)

A helper class to specify conditions on danglers.

**Attributes Summary**

|                                                                                                                          |                                    |
| ------------------------------------------------------------------------------------------------------------------------ | ---------------------------------- |
| [`dangler_type`](#samplomatic.pre_samplex.DanglerMatch.dangler_type "samplomatic.pre_samplex.DanglerMatch.dangler_type") | The desired type of dangler.       |
| [`direction`](#samplomatic.pre_samplex.DanglerMatch.direction "samplomatic.pre_samplex.DanglerMatch.direction")          | The desired direction of the node. |
| [`node_types`](#samplomatic.pre_samplex.DanglerMatch.node_types "samplomatic.pre_samplex.DanglerMatch.node_types")       | The desired type of the node.      |

**Methods Summary**

|                                                                                                                          |                                                                |
| ------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------- |
| [`match_node`](#samplomatic.pre_samplex.DanglerMatch.match_node "samplomatic.pre_samplex.DanglerMatch.match_node")(node) | Check if a node matches the conditions specified in the object |

**Attributes Documentation**

### dangler\_type

Type: `DanglerType` | [`None`](https://docs.python.org/3/builtins/constants.html#None)

Default value: `None`

The desired type of dangler.

Set to None to get both required and optional danglers.

### direction

Type: [`Direction`](/docs/api/samplomatic/auto/constants-direction "samplomatic.constants.Direction") | [`None`](https://docs.python.org/3/builtins/constants.html#None)

Default value: `None`

The desired direction of the node.

Set to None to get all node directions. Note that setting to BOTH will only match nodes with BOTH direction.

### node\_types

Type: [`tuple`](https://docs.python.org/3/builtins/stdtypes.html#tuple)\[[`type`](https://docs.python.org/3/builtins/functions.html#type)\[[`PreNode`](/docs/api/samplomatic/auto/pre-samplex-pre-node "samplomatic.pre_samplex.graph_data.PreNode")], ...] | [`None`](https://docs.python.org/3/builtins/constants.html#None)

Default value: `None`

The desired type of the node.

Set to None to get all node types.

**Methods Documentation**

### match\_node

`match_node(node: PreNode) → bool`

[GitHub](https://github.com/Qiskit/samplomatic/tree/main/samplomatic/pre_samplex/pre_samplex.py#L264-L268)

Check if a node matches the conditions specified in the object