Example Code

from langchain_community.tools.wikidata.tool import WikidataAPIWrapper, WikidataQueryRun
wikidata_tool = WikidataQueryRun(api_wrapper=WikidataAPIWrapper())
wikidata_tool.name, wikidata_tool.description

print(wikidata_tool.run("Alan Turing"))

Error Message and Stack Trace (if applicable)

TypeError Traceback (most recent call last)
Cell In[16], line 1
----> 1 print(wikidata_tool.run("Alan Touring"))

File ~.virtualenvs\udemy-llm-agents-juqR4cf2\lib\site-packages\langchain_core\tools.py:452, in BaseTool.run(self, tool_input, verbose, start_color, color, callbacks, tags, metadata, run_name, run_id, config, **kwargs)
450 except (Exception, KeyboardInterrupt) as e:
451 run_manager.on_tool_error(e)
--> 452 raise e
453 else:
454 run_manager.on_tool_end(observation, color=color, name=self.name, **kwargs)

File ~.virtualenvs\udemy-llm-agents-juqR4cf2\lib\site-packages\langchain_core\tools.py:409, in BaseTool.run(self, tool_input, verbose, start_color, color, callbacks, tags, metadata, run_name, run_id, config, **kwargs)
406 parsed_input = self._parse_input(tool_input)
407 tool_args, tool_kwargs = self._to_args_and_kwargs(parsed_input)
408 observation = (
--> 409 context.run(
410 self._run, *tool_args, run_manager=run_manager, **tool_kwargs
411 )
412 if new_arg_supported
413 else context.run(self._run, *tool_args, **tool_kwargs)
414 )
415 except ValidationError as e:
416 if not self.handle_validation_error:

File ~.virtualenvs\udemy-llm-agents-juqR4cf2\lib\site-packages\langchain_community\tools\wikidata\tool.py:30, in WikidataQueryRun._run(self, query, run_manager)
24 def _run(
25 self,
26 query: str,
27 run_manager: Optional[CallbackManagerForToolRun] = None,
28 ) -> str:
29 """Use the Wikidata tool."""
---> 30 return self.api_wrapper.run(query)

File ~.virtualenvs\udemy-llm-agents-juqR4cf2\lib\site-packages\langchain_community\utilities\wikidata.py:177, in WikidataAPIWrapper.run(self, query)
175 docs = []
176 for item in items[: self.top_k_results]:
--> 177 if doc := self._item_to_document(item):
178 docs.append(f"Result {item}:\n{doc.page_content}")
179 if not docs:

File ~.virtualenvs\udemy-llm-agents-juqR4cf2\lib\site-packages\langchain_community\utilities\wikidata.py:149, in WikidataAPIWrapper._item_to_document(self, qid)
147 for prop, values in resp.statements.items():
148 if values:
--> 149 doc_lines.append(f"{prop.label}: {', '.join(values)}")
151 return Document(
152 page_content=("\n".join(doc_lines))[: self.doc_content_chars_max],
153 meta={"title": qid, "source": f" https://www.wikidata.org/wiki/{qid}"} ,
154 )

TypeError: sequence item 0: expected str instance, FluentValue found

Description

I'm trying to use various tools from the 'langchain' library.
Call to wikidata_tool.run("string") resulted in the above error.

Identified a bug in the below code ( using latest version of the build)
https://github.com/langchain-ai/langchain/blob/master/libs/community/langchain_community/utilities/wikidata.py

Line 149: doc_lines.append(f"{prop.label}: {', '.join(values)}")

/*** source of error, here 'values' is a list not a string ***/

System Info

PIP freeze | grep langchain output

langchain==0.2.7
langchain-anthropic==0.1.19
langchain-cohere==0.1.9
langchain-community==0.2.7
langchain-core==0.2.12
langchain-experimental==0.0.62
langchain-google-genai==1.0.4
langchain-openai==0.1.14
langchain-text-splitters==0.2.2
langchainhub==0.1.20

python -m langchain_core.sys_info

System Information

> OS: Windows
> OS Version: 10.0.19045
**> Python Version: 3.10.11 (tags/v3.10.11:7d4cc5a, Apr 5 2023, 00:38:17) [MSC v.1929 64 bit (AMD64)]

Package Information

langchain_core: 0.2.12
langchain: 0.2.7
langchain_community: 0.2.7
langsmith: 0.1.84
langchain_anthropic: 0.1.19
langchain_cohere: 0.1.9
langchain_experimental: 0.0.62
langchain_google_genai: 1.0.4
langchain_openai: 0.1.14
langchain_text_splitters: 0.2.2
langchainhub: 0.1.20
langgraph: 0.0.51

Packages not installed (Not Necessarily a Problem)

The following packages were not found:

langserve

dependency graph.txt

Hi @venkee70
I encountered the same issue, and I discovered the root cause is an incompatible version of wikibase-rest-api-client .
As outlined in the documentation here , the required version should be below 0.2. To resolve this, you can use the following:

pip install --upgrade --quiet "wikibase-rest-api-client<0.2" mediawikiapi
Alternatively, you can simply try this in notebook:
%pip install --upgrade --quiet "wikibase-rest-api-client<0.2" mediawikiapi
from langchain_community.tools.wikidata.tool import WikidataAPIWrapper, WikidataQueryRun
wikidata = WikidataQueryRun(api_wrapper=WikidataAPIWrapper())
print(wikidata.run("Alan Turing"))
cc @derenrich May I ask for your advice on whether we should update the Wikidata tool to support the latest version of wikibase-rest-api-client? If so, I'd be happy to submit a PR to address this.
          
Hey. Yeah sorry for the delay. To bring this up to the most recent version we just need to change
doc_lines.append(f"{prop.label}: {', '.join(values)}")
doc_lines.append(f"{prop.label}: {', '.join([v.value or 'unknown' for v in values])}")
basically values turned from a list of strings to a list of FluentValue objects which is defined as
class FluentValue:
    value: Optional[str]
    qid: Optional[str] = None
    pid: Optional[str] = None