> ## Documentation Index
> Fetch the complete documentation index at: https://nvd-54.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Wikipedia 集成

> 使用 LangChain Python 集成 Wikipedia 检索器。

> [Wikipedia](https://wikipedia.org/) is a multilingual free online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and using a wiki-based editing system called MediaWiki. `Wikipedia` is the largest and most-read reference work in history.

This notebook shows how to retrieve wiki pages from `wikipedia.org` into the [Document](https://reference.langchain.com/python/langchain-core/documents/base/Document) format that is used downstream.

### 集成详情

<ItemTable category="external_retrievers" item="WikipediaRetriever" />

## 设置

To enable automated tracing of individual tools, set your [LangSmith](/langsmith/home) API key:

```python theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
os.environ["LANGSMITH_API_KEY"] = getpass.getpass("Enter your LangSmith API key: ")
os.environ["LANGSMITH_TRACING"] = "true"
```

### 安装

该集成位于 `langchain-community` 包中。 We also need to install the `wikipedia` python package itself.

```python theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
pip install -qU langchain-community wikipedia
```

## 实例化

现在我们可以实例化检索器：

`WikipediaRetriever` parameters include:

* optional `lang`: default="en". Use it to search in a specific language part of Wikipedia
* optional `load_max_docs`: default=100. Use it to limit number of downloaded documents. It takes time to download all 100 documents, so use a small number for experiments. There is a hard limit of 300 for now.
* optional `load_all_available_meta`: default=False. By default only the most important fields downloaded: `Published` (date when document was published/last updated), `title`, `Summary`. If True, other fields also downloaded.

`get_relevant_documents()` has one argument, `query`: free text which used to find documents in Wikipedia

```python theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
from langchain_community.retrievers import WikipediaRetriever

retriever = WikipediaRetriever()
```

## 用法

```python theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
docs = retriever.invoke("TOKYO GHOUL")
```

```python theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
print(docs[0].page_content[:400])
```

```text theme={"theme":{"light":"catppuccin-latte","dark":"catppuccin-mocha"}}
Tokyo Ghoul (Japanese: 東京喰種（トーキョーグール）, Hepburn: Tōkyō Gūru) is a Japanese dark fantasy manga series written and illustrated by Sui Ishida. It was serialized in Shueisha's seinen manga magazine Weekly Young Jump from September 2011 to September 2014, with its chapters collected in 14 tankōbon volumes. The story is set in an alternate version of Tokyo where humans coexist with ghouls, beings who loo
```

***

## API 参考

For detailed documentation of all `WikipediaRetriever` features and configurations head to the [API reference](https://reference.langchain.com/python/langchain-community/retrievers/wikipedia/WikipediaRetriever).

***

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