Topic

Function Calling in Python

13 posts on function calling in python — part of api integration on the n4n AI blog.

Testing function calling logic in Python with pytest

Learn how to build reliable tests for LLM tool-use code with pytest, isolating function-calling logic from model responses in Python step by step.

July 17, 20263 min read

API integrationHow-to

Streaming function calls with the Python OpenAI SDK

Learn how to implement streaming function calls with the Python OpenAI SDK: accumulate tool call deltas, execute functions, and stream multi-turn agent responses.

July 17, 20263 min read

API integrationTutorial

Python function calling with instructor and Pydantic

Hands-on tutorial for python instructor pydantic function calling: build structured LLM tool calls with Pydantic models and dispatch to real functions.

July 17, 20263 min read

API integrationTutorial

Python function calling with Claude via the Messages API

Step-by-step tutorial for implementing python claude messages api function calling with the Anthropic SDK, from tool schema to multi-turn tool result loops.

July 17, 20263 min read

API integrationHow-to

Parsing function call arguments safely in Python

Step-by-step approach to parsing function call arguments python safely: validate JSON, handle errors, and bind LLM outputs to typed functions.

July 17, 20263 min read

API integrationTutorial

Multi-tool function calling in Python with GPT-4o

Hands-on Python tutorial for multi-tool function calling with GPT-4o: define schemas, run parallel tool calls, and merge results correctly.

July 17, 20263 min read

API integrationTutorial

Function calling with LangChain and Python: a walkthrough

Hands-on langchain python function calling walkthrough: define tools, bind them to ChatOpenAI, execute calls, and return results with runnable code.

July 17, 20263 min read

API integrationHow-to

Error handling for OpenAI function calls in Python

Practical patterns for error handling OpenAI function calls Python: catch API failures, validate arguments, retry safely, and recover from model mistakes.

July 17, 20263 min read

API integrationTutorial

Building a weather tool with OpenAI function calling

Step-by-step Python tutorial for a weather tool using OpenAI function calling: define schema, call API, execute function, and stream responses.

July 17, 20262 min read

API integrationHow-to

Using Pydantic to define OpenAI function calling schemas

Define OpenAI tool schemas from Python types using Pydantic to avoid JSON Schema drift, with runnable steps for generation, calling, and validation.

July 16, 20263 min read

API integrationTutorial

Python function calling with n4n.ai's chat completions API

Hands-on Python tutorial for function calling with the n4n.ai API: define tools, parse model responses, execute local functions, and handle errors.

July 16, 20264 min read

API integrationTutorial

Function calling with the OpenAI Python SDK: a tutorial

Hands-on openai python sdk function calling tutorial: define tools, parse model emissions, execute local functions, and handle errors in Python.

July 16, 20263 min read

API integrationHow-to

Async function calling in Python with openai-python

Learn how to implement async function calling in Python with openai-python: define tools, run concurrent tool calls, and verify the loop end to end.

July 16, 20263 min read