Chain

chain()

The chain function abstracts away all the magic happening in the funcchain backend. It extracts the docstring, input arguments and return type of the function and compiles everything into a langchain prompt.

from funcchain import chain

def ask(question: str) -> str:
    """
    Answer the given question.
    """
    return chain()

ask("What is the capital of Germany?")
# => "The capital of Germany is Berlin."

achain()

Async version of the chain() function.

import asyncio
from funcchain import achain

async def ask(question: str) -> str:
    """
    Answer the given question.
    """
    return await achain()

asyncio.run(ask("What is the capital of Germany?"))
# => "The capital of Germany is Berlin."

@runnable

The @runnable decorator is used to compile a chain function into a langchain runnable object. You just write a normal funcchain function using chain() and then decorate it with @runnable.

from funcchain import chain, runnable

@runnable
def ask(question: str) -> str:
    """
    Answer the given question.
    """
    return chain()

ask.invoke(input={"question": "What is the capital of Germany?"})
# => "The capital of Germany is Berlin."