An error occurred: 'DDGS' object does not support the context manager protocol

[ZhuJD-China]

System Info

Entering new AgentExecutor chain...

Invoking: duckduckgo_search with 2023年8月的新闻

An error occurred: 'DDGS' object does not support the context manager protocol

Who can help?

@hwchase17
@agola11

Information

• The official example notebooks/scripts
• My own modified scripts

Related Components

• LLMs/Chat Models
• Embedding Models
• Prompts / Prompt Templates / Prompt Selectors
• Output Parsers
• Document Loaders
• Vector Stores / Retrievers
• Memory
• Agents / Agent Executors
• Tools / Toolkits
• Chains
• Callbacks/Tracing
• Async

Reproduction

初始化OpenAI Functions代理

agent = initialize_agent(
# tools,

tools=load_tools(["ddg-search"]),

llm=llm,

agent=AgentType.OPENAI_FUNCTIONS,

verbose=True,
agent_kwargs=agent_kwargs,
memory=memory,
max_iterations=10,
early_stopping_method="generate",
handle_parsing_errors=True,  # 初始化代理并处理解析错误
callbacks=[handler],

)

Entering new AgentExecutor chain...

Invoking: duckduckgo_search with 2023年8月的新闻

An error occurred: 'DDGS' object does not support the context manager protocol

Expected behavior

该类提供了通过 DuckDuckGo 搜索引擎搜索的功能。

from langchain.tools import DuckDuckGoSearchRun
search = DuckDuckGoSearchRun()
search.run("Who is winner of FIFA worldcup 2018?")
你应该期望如下输出：

The 2018 FIFA World Cup was the 21st FIFA World Cup, ... Mario Zagallo (Brazil) and Franz Beckenbauer (Germany) have also achieved the feat.

[dosubot]

🤖

您好，

根据您提供的信息，我注意到您在尝试使用LangChain框架中的DuckDuckGoSearchRun功能时遇到了问题。这个问题的原因是'DDGS'对象不支持上下文管理器协议，这是因为LangChain框架中的DuckDuckGoSearchRun类没有实现__enter__和__exit__方法。在Python中，这两个方法是必须的，以便一个对象可以作为上下文管理器与'with'语句一起使用。

如果您想让'DDGS'对象支持上下文管理器协议，您需要在DuckDuckGoSearchRun类中添加这些方法。以下是一个可能的实现方式：

class DuckDuckGoSearchRun(BaseTool):
    # existing code...

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        # clean up resources here, if necessary
        pass

添加了这些方法后，您可以像这样将'DDGS'对象作为上下文管理器使用：

with DuckDuckGoSearchRun() as ddgs:
    # use ddgs here...

然而，这是否必要或适当取决于您的应用程序的具体需求和设计。

关于'DDGS'对象是否需要支持上下文管理器协议以便在LangChain框架中进行预期的使用，我在仓库中没有找到答案，但答案可能在其他地方可用，或者我可能错过了它。

如果您有任何其他问题或需要进一步的帮助，请随时告诉我。

Sources

• libs/langchain/langchain/tools/ddg_search/tool.py

---

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[dosubot]

Hi, @ZhuJD-China! I'm Dosu, and I'm helping the LangChain team manage our backlog. I wanted to let you know that we are marking this issue as stale.

From what I understand, you encountered an error when using the 'DDGS' object in the context manager protocol. You provided detailed information about the system and reproduction steps. One of our users, "dosubot", suggested modifying the code in the 'DuckDuckGoSearchRun' class by adding the __enter__ and __exit__ methods, which would allow the 'DDGS' object to be used as a context manager. Since then, there haven't been any further updates or responses.

Before we close this issue, we wanted to check if it is still relevant to the latest version of the LangChain repository. If it is, please let us know by commenting on the issue. Otherwise, feel free to close the issue yourself, or it will be automatically closed in 7 days.

Thank you for your understanding and contribution to the LangChain project! Let us know if you have any further questions or concerns.