I am trying out Quart with Hypercorn in Python 3.8. From what I understand, Quart is typically used for single threaded applications. But I see that Hypercorn has a –workers option to run the app. How can a single threaded app benefit from using multiple workers? Answer Each worker is a separate process…
Tag: python-asyncio
Error whenever I run code that requires aiohttp library
Whenever I run code which requires aiohttp, I get the error below: Examples of codes I’ve tried to run from https://docs.aiohttp.org/en/stable/ include: and I’ve tried several other examples but they all produce the same error. What could be causing this?. I’m using python 3.8.6 and the late…
Separating async requests and saving using aiohttp
I am currently calling an external API many times and downloading the response’s content from each call. I am using aiohttp and asyncio to speed up this process, but am having trouble figuring out how to separate the fetch functionality from the save functionality. Setup Currently, I am using the follow…
Python Asyncio – Pythonic way of waiting until condition satisfied
I need to wait until a certain condition/equation becomes True in a asynchronous function in python. Basically it is a flag variable which would be flagged by a coroutine running in asyncio.create_task(). I want to await until it is flagged in the main loop of asyncio. Here’s my current code: Is there a…
Opposite of asyncio.to_thread
How do I run asynchronous function in blocking style? I am not allowed to modify signature of my mock function f1() and can’t easy switch to async def and so can’t use await expression. I tried asyncio.get_running_loop().run_until_complete(t), but the hack does not work and I get the next error. A…
Needs assistance with Async or Multithreading task
I’m new in parallel programming currently needs to run app as a background process which contains several tasks inside. Currently executing only do_something(), it blocks execution of do_something2(). Could please anyone explain me how to implement that? Should I use asyncio or something else? Thank you…
How to save UploadFile in FastAPI
I accept the file via POST. When I save it locally, I can read the content using file.read (), but the name via file.name incorrect(16) is displayed. When I try to find it by this name, I get an error. What might be the problem? My code: Answer Background UploadFile is just a wrapper around SpooledTemporaryFi…
Using an asynchronous function in __del__
I’d like to define what essentially is an asynchronous __del__ that closes a resource. Here’s an example. This works, printing destructing and closing as expected. However, if the resource is defined outside an asynchronous function, __del__ is called, but closing is never performed. No warning is…
aiohttp.client_exceptions.ClientConnectorError: Cannot connect to host stackoverflow.com:443 ssl:default [Connect call failed (‘151.101.193.69’, 443)]
here is my code: if I run it on my computer, everything works, but if I run it on pythonanywhere, I get this error: aiohttp on hosting: aiohttp on my PC: I am at a loss that it is not so? I am running both files using python3.8. I also tried other urls, they have the same problem Do I
Write a CSV file asynchronously in Python
I am writing a CSV file with the following function: However, as there is no await allowed over writerows method, there are no rows being written into the CSV file. How to resolve this issue? Is there any workaround available? Thank you. Entire code can be found here. Answer In my opinion it’s better not to t…