NameError: name 'OpenAPIEndpointChain' is not defined

[v3551G]

按照官方流程配置玩环境， 最终定位到了langchain-community包下的tools.py文件这里，

"""Tool for interacting with a single API with natural language definition."""

from __future__ import annotations

from typing import TYPE_CHECKING, Any, Optional

from langchain_core.language_models import BaseLanguageModel
from langchain_core.tools import Tool

from langchain_community.tools.openapi.utils.api_models import APIOperation
from langchain_community.tools.openapi.utils.openapi_utils import OpenAPISpec
from langchain_community.utilities.requests import Requests

if TYPE_CHECKING:
    from langchain.chains.api.openapi.chain import OpenAPIEndpointChain


class NLATool(Tool):
    """Natural Language API Tool."""

    @classmethod
    def from_open_api_endpoint_chain(
        cls, chain: OpenAPIEndpointChain, api_title: str
    ) -> "NLATool":
        """Convert an endpoint chain to an API endpoint tool."""
        expanded_name = (
            f'{api_title.replace(" ", "_")}.{chain.api_operation.operation_id}'
        )
        description = (
            f"I'm an AI from {api_title}. Instruct what you want,"
            " and I'll assist via an API with description:"
            f" {chain.api_operation.description}"
        )
        return cls(name=expanded_name, func=chain.run, description=description)

报错NameError: name 'OpenAPIEndpointChain' is not defined, 这可能是这TYPE_CHECKING导致没有导入这个模块，

应该怎么解决？

[dosubot[bot]]

🤖

To resolve the NameError: 'OpenAPIEndpointChain' is not defined in the tools.py file under the langchain-community package, you can follow these steps:

1. Ensure that OpenAPIEndpointChain is correctly defined and accessible within the scope of your tools.py file or its imports. If OpenAPIEndpointChain is defined in a separate module, you need to import it explicitly in your tools.py file or in the files where it's being used.

2. If OpenAPIEndpointChain is only needed for type annotations and you're using it within a type checking block, make sure to import it conditionally to avoid runtime errors. Python provides a built-in constant TYPE_CHECKING from the typing module for this purpose. When the Python interpreter runs, TYPE_CHECKING is False, but type checkers (like mypy) will treat it as True. This allows for conditional imports that are only recognized by type checkers and not at runtime, preventing NameError.

Here's how you can conditionally import OpenAPIEndpointChain using TYPE_CHECKING:

from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from some_module import OpenAPIEndpointChain

Replace some_module with the actual module name where OpenAPIEndpointChain is defined.

3. If OpenAPIEndpointChain is indeed supposed to be imported from an external package or module and you've confirmed it's correctly installed, ensure that the import path you're using is correct. Sometimes, modules or classes are moved within a package, leading to import errors.

4. If the issue persists, it might be helpful to check if there's a circular import issue. Circular imports occur when two or more modules depend on each other to function. This can sometimes lead to parts of a module being uninitialized, causing NameError. Refactoring the code to avoid such circular dependencies or moving the imports to a local scope within the functions can help.

Given the context provided, there's no direct reference to OpenAPIEndpointChain in the snippet. Therefore, ensure to apply the conditional import strategy in the appropriate file where OpenAPIEndpointChain is actually needed, following the steps above.

As for your question about whether the OpenAPIEndpointChain class is defined in the langchain.chains.api.openapi.chain module as the import statement suggests, I wasn't able to find an answer within the repository. The answer may be available elsewhere or I could have missed it. If you have more information about where OpenAPIEndpointChain is defined, it would be helpful in providing a more accurate solution.

Sources

• server/agent/tools/init.py

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[zRzRzRzRzRzRzR]

这个是运行什么时候报错的，我没有用到这个内容诶

[v3551G]

startup启动时遇到这个问题？ 调试了下不知道什么原因导致TYPE_CHECKING=False, 所以OpenAPIEndpointChain没有导入进来

[zRzRzRzRzRzRzR]

这个应该是你本地环境的问题，没有办法复现

[github-actions[bot]]

这个问题已经被标记为 stale ，因为它已经超过 30 天没有任何活动。