All Questions
Tagged with python-asyncio python-3.x
2,161 questions
134
votes
3
answers
125k
views
What does asyncio.create_task() do?
What does asyncio.create_task() do? A bit of code that confuses me is this:
import asyncio
async def counter_loop(x, n):
for i in range(1, n + 1):
print(f"Counter {x}: {i}")
...
- 27.4k
68
votes
4
answers
49k
views
How to use asyncio with existing blocking library?
I have a few blocking functions foo, bar and I can't change those (Some internal library I don't control. Talks to one or more network services). How do I use it as async? E.g. I want to do the ...
- 6,722
1
vote
1
answer
9k
views
Asyncio StreamReader occasionally reads 0 bytes
I have a simple streamreader that is listening to a TCP port for a websocket implementation. The stream occasionally reads (every 30-300 second) blank data and throws an error.
loop = asyncio....
CommunityBot
- 1
0
votes
1
answer
23
views
Asyncio: read new data from process stdout without blocking monitoring task
I write asynchronous process manager, and up till now I came up with this:
import asyncio
class AsyncLocalProcessManager:
def __init__(self):
self.process = None
async def submit(...
- 17.6k
0
votes
0
answers
39
views
Error processing SNMP request: Component value is tag-incompatible
I am trying to write a mock snmp server using pysnmp library in python.
https://pypi.org/project/pysnmp/
I start the server using,
python mock_snmp_server.py
python --version gives Python 3.11.4
I ...
- 21.1k
0
votes
3
answers
134
views
Converting Python socket server to Asyncio
I have already converted a multi-treaded HTTP proxy ran by a socket server into a single-treaded proxy ran by Asyncio. And, it works well for HTTP. However, when I try to reproduce the same with SSL ...
- 70
0
votes
2
answers
569
views
How to use asyncio.as_completed() with a variable size task list
Challenge
Suppose I have a list L=30 tasks. Each task takes a variable time to complete and has a 10% chance of failing. If a task T fails, add the task back to a queue and prioritize it's completion. ...
- 1
70
votes
2
answers
64k
views
Using queues results in asyncio exception "got Future <Future pending> attached to a different loop"
I'm trying to run this simple code with asyncio queues, but catch exceptions, and even nested exceptions.
I would like to get some help with making queues in asyncio work correctly:
import asyncio, ...
- 1.1m
9
votes
1
answer
6k
views
Python Asyncio errors: "OSError: [WinError 6] The handle is invalid" and "RuntimeError: Event loop is closed" [duplicate]
I am having some difficulties with properly with my code, as I get the following error after my code finishes executing while debugging on VSCode:
Exception ignored in: <function ...
- 35.7k
120
votes
10
answers
142k
views
How can I periodically execute a function with asyncio?
I'm migrating from tornado to asyncio, and I can't find the asyncio equivalent of tornado's PeriodicCallback. (A PeriodicCallback takes two arguments: the function to run and the number of ...
- 1.1m
5
votes
3
answers
11k
views
asyncio multiple concurrent servers
I'm trying to use Python's asyncio to run multiple servers together, passing data between them. For my specific case I need a web server with websockets, a UDP connection to an external device, as ...
- 42.1k
14
votes
1
answer
27k
views
SQLAlchemy AttributeError: 'AsyncEngine' object has no attribute '_run_ddl_visitor'
I am trying to use the async version of SQLAlchemy in an asyncio app. However, when trying to create the tables using Metadata().create_all(), the following error occurs
AttributeError: 'AsyncEngine' ...
291
votes
10
answers
393k
views
Simplest async/await example possible in Python
I've read many examples, blog posts, questions/answers about asyncio / async / await in Python 3.5+, many were complex, the simplest I found was probably this one.
Still it uses ensure_future, and for ...
- 33.1k
1
vote
1
answer
4k
views
Pausing Python asyncio coroutines
As my project heavily relies on asynchronous network I/O, I always have to expect some weird network error to occur: whether it is the service I'm connecting to having an API outage, or my own server ...
- 32.3k
1
vote
1
answer
48
views
pyserial-asyncio client/server in Python 3.8 not communicating immediately
I'm learning python and asyncio and after having success with asyncio for a TCP client/server I took my first stab at creating a serial client/server using pyserial-asyncio running in bash on a ...
- 11k