# callbacks

> **Module** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/callbacks)

**Callback handlers** allow listening to events in LangChain.

## Properties

- `DEPRECATED_LOOKUP`

## Methods

- [`create_importer()`](https://reference.langchain.com/python/langchain-classic/callbacks/create_importer)

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/c59e83a1ffba63d709ea4847445845edd82085dc/libs/langchain/langchain_classic/callbacks/__init__.py)