Скачать или смотреть How to Schedule Invocation of Functions with Arguments in Python's Event Loop

Learn how to effectively schedule the invocation of functions with arguments as part of Python's event loop using asyncio features. This guide breaks down the process clearly and simply!
---
This video is based on the question https://stackoverflow.com/q/63600634/ asked by the user 'Nir Rozen' ( https://stackoverflow.com/u/7339198/ ) and on the answer https://stackoverflow.com/a/63601235/ provided by the user 'Harry333Cover' ( https://stackoverflow.com/u/7510808/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Schedule Invokation of functions with arguments to the event loop

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Schedule Invocation of Functions with Arguments in Python's Event Loop

When working with asynchronous programming in Python, particularly with the asyncio library, it’s common to encounter situations where you need to invoke specific functions based on incoming server requests. A frequently asked question in this domain is, "How do I invoke a function with arguments as part of the event loop?" This guide aims to clarify this process in a straightforward manner.

Understanding the Problem

In many cases, server applications need to handle incoming requests dynamically. You may have several functions which need to be executed based on the content of these requests, and you want each function to receive specific arguments. In the provided code snippet, a dispatcher function is tasked with handling different methods, where each method correlates to a different asynchronous function that needs to be invoked multiple times.

Here's a quick look at the relevant part of the code before we explore how to manage the invocation of those functions:

[[See Video to Reveal this Text or Code Snippet]]

In the above context, you need to know how to call func with the necessary parameters (message and writer) as arguments while ensuring it's part of the asyncio event loop.

Solution Breakdown

The solution to invoking the function with arguments within the asyncio event loop is fairly straightforward. Let's break it down step-by-step.

Step 1: Define the Functions

We already have our asynchronous functions defined, which will take specific arguments:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Map the Functions

The switcher dictionary serves as a mapping between method names and the corresponding functions:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Call the Function with Parameters

To invoke the appropriate function based on the incoming request, you simply need to call it with the required arguments using the await keyword, ensuring that you're waiting for the asynchronous function to complete. Replace the commented line where the function should be called with the following code:

[[See Video to Reveal this Text or Code Snippet]]

This will result in complete code like this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Invoking asynchronous functions within Python's asyncio event loop can initially seem daunting, especially when arguments are involved. By following the steps outlined above, you can efficiently handle multiple incoming server requests, allowing functions to be invoked dynamically with the necessary parameters.

Now, whether you're building chat applications, web servers, or any other asynchronous Python applications, you'll have the tools needed to manage function invocations seamlessly!

If you have any further questions or need assistance with specific use cases, feel free to reach out. Happy coding!