# lru_cache

> **Function** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/_openapi_client/_utils/_utils/lru_cache)

A version of functools.lru_cache that retains the type signature
for the wrapped function arguments.

## Signature

```python
lru_cache(
    *,
    maxsize: int | None = 128,
) -> Callable[[CallableT], CallableT]
```

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[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/d6cd6082f09e7826a2d6afe444ae6119e61b82a6/python/langsmith/_openapi_client/_utils/_utils.py#L410)