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0answers
65views
How can I create a tool for langgaph's agent to save data in db?
I created an agent using Langgraph in Python, and I developed a tool for them to save a todo in a database. But that tool doesn't work and raises an error!I use SQLAlchemy to connect to the DB.This ...
0votes
0answers
30views
FastAPI WebSocket + Kafka: Only the last connected client receives messages [closed]
I'm building a real-time dashboard using FastAPI WebSockets + Kafka. Everything works perfectly for a single user, but when multiple users connect, only the most recently connected user receives ...
0votes
1answer
54views
Monitor `asyncio.create_subprocess_exec` pipes for errors
I am trying to pipe multiple Linux commands and abort if there is an error. With Popen the communicate() method waits for all commands to finish. This is why I am trying asyncio now.I have the ...
- 2,491
0votes
1answer
82views
I have two simple Python functions with time.sleep and reading data so I/O-bound but I don't get expected behavior from threading and asyncio
Previously I had a question on an example of multiprocessing which you can see in the following linkI used a 2 workers pool to split a sum in a function with Python multiprocessing but the timing ...
2votes
1answer
75views
Can't use lock around gather in Python asyncio
For some reason, this code doesn't work on Ubuntu 20, Python 3.8.10, unless the .gather line is commented out.It works on Ubuntu 24, Python 3.12.3 and Windows 11, Python 3.13.9.It doesn't work on ...
- 23
1vote
1answer
55views
how to make socket server propagate exceptions up to TaskGroup where they're started from?
How to make exceptions thrown from a socket server running in a task group task be propagated up to its parent TaskGroup? With given example, I'd expect to see the error raised from ...
- 608
3votes
2answers
85views
Python asyncio.gather returning Future attached to differnt loop exception
I am using Python 3.13.2.I am going through the Python asyncio tutorial here. At around 10:20 timestamp, the instructor shows an example of asyncio.gather with a coroutine accepting a Future.Here is ...
1vote
0answers
80views
How to use multiprocessing with an asyncio process and a command line subprocess?
How would I be able to start a multiprocess when one of the tasks uses Asyncio and another task uses a subprocess to run?Here is the main function:import asyncioimport aioprocessingimport ...
- 1,631
Best practices
0votes
2replies
76views
Python AsyncIO Graceful shutdown
No matter how much I search (or maybe I'm searching incorrectly), I can't find a decent way to terminate my tasks in Python AsyncIO.I know what:- I need to bind to signals (SIGINT, SIGTERM) using ...
- 23
2votes
1answer
65views
Long running asyncio tasks freeze after ~1 hour. How can I debug?
I have a long running Python application built on asyncio. It launches several background tasks that run indefinitely and occasionally performs CPU work using asyncio.to_thread. Everything works fine ...
Advice
1vote
5replies
147views
How does Python differentiate between async function calls and actual I/O operations?
I understand that:await some_async_function() doesn't yield control - it just calls the function synchronouslyawait some_io_function() DOES yield control to the event loopBut what's the actual ...
- 1,140
5votes
2answers
123views
How much longer will an asyncio task sleep?
I have a long running task which is executing a coroutine that calls asyncio.sleep() with a large value.In another task I need to know how much longer the long task will sleep. I can get the long ...
- 183
0votes
1answer
98views
Parallelize asynchronous API calls in Python
I’m building a data ingestion pipeline in Python that collects data from a third-party REST API.The API allows a maximum of 100 requests per minute, and I need to fetch data for tens of thousands of ...
- 214
2votes
1answer
100views
Asynchronous listening and processing in a Pyside app
I am having difficulties integrating asyncio with Pyside.What I want to acheive:I have several emitters (up to 30) sending messages independently every few milliseconds (200ms) in multicast.I have ...
- 337
1vote
1answer
110views
Why are my asyncio HTTP requests not overlapping as expected for I/O?
I'm trying to make a bunch of HTTP GET requests to different endpoints of the same API. My understanding is that asyncio helps me manage concurrent I/O operations efficiently, meaning when one network ...
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