EventLoop | : heart : Passionate about Technology & Tech Education | Runtime Evironment library

I am using KivyMD and I am trying to get the text from the text input in kivyMD. I keep getting the following error:

From the docs it seems the recommended way to kickstart a asyncio application is to use asyncio.run(), so my application looks like this:

I need to connect a QAbstractItemModel on a client computer to data on a server computer. I already have a nice class which handles data requests/responses asynchronously across the network (from another project), which emits a signal when data arrives.

I'm just trying to figure out how to allow the QAbstractItemModel methods (like data and rowCount) to behave asynchronously. I can override these methods and insert an eventloop which exits on data arrival, but that doesn't feel right.

I'm sure I once saw an example of this online but cannot find it. Can someone offer or point to a way to achieve this?

JavaScript's event loop uses a message queue to schedule work, and runs each message to completion before starting the next. As a result, a niche-but-surprisingly-common pattern in JavaScript code is to schedule a function to run after the messages currently in the queue have been processed using setTimeout(fn, 0). For example:

Please let me know the solution to fix it as didn't find much on google. Faced this error while trying to start jupyter notebook from anaconda. But can open it from cmd. Environment variables of anaconda are properly configured.

I'm getting the following error while trying to make a get request to the NewsApi.org api. Everything seems to be correct according to their documentation, and my setup is basically the same as a lot of tutorials and some come samples I found on github.

I got this error when trying to run Spark Streaming to read data from Kafka, I searched it on google and the answers didn't fix my error.

I fixed a bug here Exception in thread "main" java.lang.NoClassDefFoundError: scala/Product$class ( Java) with the answer of https://stackoverflow.com/users/9023547/chandan but then got this error again.

This is terminal when I run project :

I'm creating a column in a dataframe that is an array of 4 structs. Any of them could be null, but since I need to have a fixed number of items in this array, I need to clean out the null items after the fact. I'm getting an error when trying to use a UDF to remove the null items though. Here's an example:

Create the data frame, notice one of the "a" value is None

I'm writing an event-driven program with the event scheduling written in C. The program uses Python for extension modules. I would like to allow extension modules to use async/await syntax to implement coroutines. Coroutines will just interact with parts of my program, no IO is involved. My C scheduler is single-threaded and I need coroutines to execute in its thread.

In a pure Python program, I would just use asyncio as is, and let my program use its event loop to drive all events. This is however not an option; my event loop needs to serve millions of C-based events per second and I cannot afford Python's overheads.

I tried to write my own event loop implementation, that delegates all scheduling to my C scheduler. I tried a few approaches:

• Re-implement EventLoop, Future, Task etc to imitate how asyncio works (minus IO), so that call_soon delegates scheduling to my C event loop. This is safe, but requires a bit of work and my implementation will always be inferior to asyncio when it comes to documentation, debugging support, intricate semantic details, and correctness/test coverage.
• I can use vanilla Task, Future etc from asyncio, and only create a custom implementation of AbstractEventLoop, delegating scheduling to my C event loop in the same way. This is pretty straightforward, but I can see that the vanilla EventLoop accesses non-obvious internals (task._source_traceback, _asyncgen_finalizer_hook, _set_running_loop), so my implementation is still second class. I also have to rely on the undocumented Handle._run to actually invoke callbacks.
• Things appeared to get simpler and better if I subclassed from BaseEventLoop instead of AbstractEventLoop (but docs say I shouldn't do that). I still need Handle._run, though.
• I could spawn a separate thread that run_forever:s a vanilla asyncio.DefaultEventLoop and run all my coroutines there, but coroutines depend on my program's extension API, which does not support concurrent calls. So I must somehow make DefaultEventLoop pause my C event loop while calling Handle._run(). I don't see a reasonable way to achieve that.

Any ideas on how to best do this? How did others solve this problem?