# get_parser

> **Function** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/chains/query_constructor/parser/get_parser)

Return a parser for the query language.

## Signature

```python
get_parser(
    allowed_comparators: Sequence[Comparator] | None = None,
    allowed_operators: Sequence[Operator] | None = None,
    allowed_attributes: Sequence[str] | None = None,
) -> Lark
```

## Parameters

| Name | Type | Required | Description |
|------|------|----------|-------------|
| `allowed_comparators` | `Sequence[Comparator] \| None` | No | The allowed comparators. (default: `None`) |
| `allowed_operators` | `Sequence[Operator] \| None` | No | The allowed operators. (default: `None`) |
| `allowed_attributes` | `Sequence[str] \| None` | No | The allowed attributes. (default: `None`) |

## Returns

`Lark`

Lark parser for the query language.

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/f0c5a28fa05adcda89aebcb449d897245ab21fa4/libs/langchain/langchain_classic/chains/query_constructor/parser.py#L257)