# TransformChain

> **Class** in `langchain_classic`

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

Chain that transforms the chain output.

## Signature

```python
TransformChain()
```

## Description

**Example:**

```python
from langchain_classic.chains import TransformChain
transform_chain = TransformChain(input_variables=["text"],
 output_variables["entities"], transform=func())

```

## Extends

- `Chain`

## Properties

- `input_variables`
- `output_variables`
- `transform_cb`
- `atransform_cb`
- `input_keys`
- `output_keys`

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/f4bc5031dbcf24edb0374a07830915a285222567/libs/langchain/langchain_classic/chains/transform.py#L20)