Code writing

Example of how to use LCEL to write Python code.

from langchain.chat_models import ChatOpenAI
from langchain.prompts import ChatPromptTemplate, SystemMessagePromptTemplate, HumanMessagePromptTemplate
from langchain.schema.output_parser import StrOutputParser
from langchain.utilities import PythonREPL

API Reference:

• ChatOpenAI
• ChatPromptTemplate
• SystemMessagePromptTemplate
• HumanMessagePromptTemplate
• StrOutputParser
• PythonREPL

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'