Issues with loop scope when using async functions in Python 3.9
I'm integrating two systems and I'm currently working with asynchronous code in Python 3.9 and I'm running into a confusing issue with loop scope... I have a list of URLs that I want to fetch data from, and I'm using an async function within a loop to handle each request. However, I’m getting unexpected behaviors when I try to access the loop variable inside the async function. Here’s a simplified version of my code: ```python import aiohttp import asyncio async def fetch(session, url): async with session.get(url) as response: return await response.text() async def main(urls): async with aiohttp.ClientSession() as session: for url in urls: data = await fetch(session, url) print(f'Data fetched from {url} with length {len(data)}') urls = ['http://example.com', 'http://example.org'] asyncio.run(main(urls)) ``` What I expected was for the program to print the fetched data length from each URL. However, in my actual implementation, I’m also trying to log the URL before the fetch call, but it seems like the URL is not being captured correctly. Sometimes it prints the last URL multiple times instead of the expected one. This issue only arises when the fetch function runs concurrently for multiple URLs. I've tried moving the fetch call into a separate function, but I still face the same issue. Is there a known issue with variable scope in async loops like this? How can I properly capture the URL in each iteration so that the correct one is logged and fetched? Any insights would be greatly appreciated! My development environment is Ubuntu. Am I missing something obvious? This is part of a larger mobile app I'm building.