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LangChain ↗ is the most popular framework for building AI applications powered by large language models (LLMs).

LangChain publishes multiple Python packages. The following are provided by the Workers runtime:

Get Started

Clone thecloudflare/python-workers-examples repository and run the LangChain example:

Terminal window
gitclonehttps://github.com/cloudflare/python-workers-examples
cd04-langchain
uvrunpywranglerdev

Example code

Python
from workersimport WorkerEntrypoint, Response
from langchain_core.promptsimport PromptTemplate
from langchain_openaiimport OpenAI
classDefault(WorkerEntrypoint):
asyncdeffetch(self,request):
prompt= PromptTemplate.from_template("Complete the following sentence: I am a{profession} and ")
llm=OpenAI(api_key=self.env.API_KEY)
chain= prompt| llm
res=await chain.ainvoke({"profession":"electrician"})
returnResponse(res.split(".")[0].strip())
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