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- Waiting in Python In specific scenarios, introducing pauses or waits in a program becomes necessary. The time module provides a simple yet effective way to accomplish this using the time.sleep() function. import time # Wait for 3 seconds time.sleep(3) print("Waited for 3 seconds!")
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Dec 14, 2023 · We’ll take you step-by-step through the Python wait function’s usage in this tutorial, covering both fundamental and sophisticated methods. We’ll go over everything, including how to use the time.sleep () function and more advanced applications like loops and threading. Prerequisites: time module. keyboard module.
If you would like to put a time delay in a Python script: Use time.sleep or Event().wait like this:
Jul 12, 2023 · This approach uses the asyncio.wait() function to wait for multiple awaitable objects (such as coroutines or tasks) to complete concurrently with a timeout. The function returns two sets of completed and pending awaitables.
Jan 19, 2024 · Waiting in Python is a skill that enhances the efficiency and responsiveness of your applications. Whether dealing with primary time delays or managing concurrent tasks, the techniques presented here offer a comprehensive toolkit.
- An Example Application That Waits
- The Ugly: Busy Waiting
- The Bad: Busy Waiting with Sleep
- The Good #1: Joining The Thread
- The Good #2: Waiting on An Event
- The Good #3: Waiting While Displaying A Progress Percentage
- More Ways to Wait!
- Waiting in asyncio
- Conclusion
To show you these wait patterns, I'm going to use an example application, shown below: In this application, the background_calculation() function performs some computation that is slow. To keep this example simple, I have coded this function with a time.sleep() call with a random time of up to 5 minutes. When the function reaches the end, a result ...
The easiest and most intuitive way to perform this wait is to use a while-loop: If you want to try this, here is the complete script that you can copy/paste: This is a really bad way to wait. Can you tell why? If you want to experience it, you can try the script on your system. As soon as the script runs, open your Task Manager on Windows, Activity...
It is interesting that in the busy waiting example from the previous section, you would think that having an empty loop should give less work to the CPU, but in fact the contrary happens. So the obvious improvement to the previous solution is to add something inside the while-loop that puts a brake to the CPU frantically evaluating the while-loop e...
Let's say that we want our wait to be as efficient as possible. We want the wait to be over at the exact moment the result is produced by the calculation thread. How can we do that? Solutions implemented just with Python logic like the previous two are not going to work, because to determine if the thread finished we need to run some Python code. I...
If you need to wait for a thread to finish, the pattern I presented in the previous section is what you should use. But of course, there are many other situations in which you may need to wait for things other than threads, so how do you wait for some sort of ordinary event not tied to a thread or other operating system resource? To show you how to...
One great thing about event objects is that they are general purpose, so you are going to find a lot of situations in which they can be useful if you apply a little bit of creativity. For example, consider this common pattern when writing a background thread function: Here we are trying to write a thread that can be terminated gracefully by setting...
Event objects are not the only way to wait for events in your application, there are more ways, some of which may be more appropriate than events, depending on what you are waiting for. If you need to watch a directory for files and act on the files as they are dropped there or when existing files are modified, an event is not going to be useful be...
If you are using the asyncio package, then you have access to similar types of waiting functions. For example, there are asyncio.Event and asyncio.Queueobjects that are modeled after the original ones in the standard library, but based on the async/await style of programming.
I hope this article motivates you to think more carefully about how you wait in your applications. I suggest you play with all the examples I provided to familiarize with these techniques and eventually use them to replace inefficient time.sleep()calls in your code!
Dec 29, 2022 · In this article, we have explored several ways to wait in Python, each with its own set of advantages and disadvantages. Whether you’re using the time module, asyncio , threading , or signal , you have a variety of options for pausing the execution of your code and controlling the flow of your program.
Oct 23, 2023 · The cornerstone of asynchronous programming in Python is the await keyword, which allows you to write non-blocking code. In this article, we'll explore asyncio and dive into 10 code examples...
