代码编写

如何使用 LCEL 编写 Python 代码的示例。

pip install --upgrade --quiet  langchain-core langchain-experimental langchain-openai

from langchain_core.output_parsers import StrOutputParser
from langchain_core.prompts import (
    ChatPromptTemplate,
)
from langchain_experimental.utilities import PythonREPL
from langchain_openai import ChatOpenAI

template = """Write some python code to solve the user's problem. 

Return only python code in Markdown format, e.g.:

```python
....
```"""
prompt = ChatPromptTemplate.from_messages([("system", template), ("human", "{input}")])

model = ChatOpenAI()

def _sanitize_output(text: str):
    _, after = text.split("```python")
    return after.split("```")[0]

chain = prompt | model | StrOutputParser() | _sanitize_output | PythonREPL().run

chain.invoke({"input": "whats 2 plus 2"})

Python REPL can execute arbitrary code. Use with caution.

'4\n'