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How to use asyncio await function

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by vinitha@openweaver.com dot icon Updated: Sep 19, 2023

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Asyncio is a Python library. It provides a framework for writing asynchronous, non-blocking code. You can write code that runs simultaneously using async and await. 


This helps with tasks that involve I/O operations. You can use the asyncio library to create and manage coroutines. You can schedule these coroutines to run at the same time. You can also coordinate and synchronize these coroutines functions using concurrent request primitives. 


Here are some of the key features and capabilities that make asyncio valuable:  

  • Asynchronous Programming  
  • Event Loop  
  • Concurrency Primitives  
  • Timeouts and Delays  
  • Python Standard Library Integration  


With asyncio functions, you can make and control two main types of coroutines and tasks.  

  • Functions in coroutines can pause and resume during execution. Coroutine objects are the building blocks of asynchronous programming in asyncio.  
  • Tasks are a higher-level abstraction built on top of coroutines. They represent the execution of a coroutine. It provides additional functionality for managing and monitoring its execution.  
  • Python asyncio provides several APIs for working with tasks and coroutines. The await keyword is important in this Python framework for asynchronous programming. Here's a brief explanation of how await works in asyncio:  
  • To pause a coroutine's execution, use the await keyword before an asynchronous operation. You can use different types of objects for this operation, like a function or coroutine.  


In summary, asyncio and await are valuable tools for developers. They simplify the complexities of asynchronous programming. It improves application responsiveness and enhances resource efficiency. Developers can create highly scalable, responsive, and efficient applications. It meets the demands of modern computing environments.  

Fig: Preview of the output that you will get on running this code from your IDE

Code

In this solution we are using asyncio library

Python asyncio double await

PythondotLines of Code : 22dotLicense : Strong Copyleft (CC BY-SA 4.0)

RuntimeError: await wasn't used with future

import asyncio
from random import randint


async def work():
    return randint(1, 100)


async def page():
    return await asyncio.gather(*[work() for _ in range(10)])


async def run():
    results = await page()
    return max(list(results))


result = asyncio.run(run())
print(result)

Instruction

Follow the steps carefully to get the output easily.


  1. Download and Install the PyCharm Community Edition on your computer.
  2. Open the terminal and install the required libraries with the following commands.
  3. Install asyncio - pip install asyncio
  4. Create a new Python file on your IDE.
  5. Copy the snippet using the 'copy' button and paste it into your python file.
  6. Run the current file to generate the output.


I hope you found this useful.


I found this code snippet by searching for ' Python asyncio double await ' in Kandi. You can try any such use case!

Environment tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. PyCharm Community Edition 2023.1
  2. The solution is created in Python 3.11.1 Version
  3. asyncio 0.21.0 Version


Using this solution, we can able to use asyncio await function with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to use asyncio await function.

Dependency library

pytest-asyncioby pytest-dev

Python doticonstar image 1153 doticonVersion:v0.21.0doticon
License: Permissive (Apache-2.0)

Asyncio support for pytest

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            pytest-asyncioby pytest-dev

            Python doticon star image 1153 doticonVersion:v0.21.0doticon License: Permissive (Apache-2.0)

            Asyncio support for pytest
            Support
              Quality
                Security
                  License
                    Reuse

                      You can search for any dependent library on kandi like ' asyncio '.

                      FAQ:  

                      1. What is the async def factorial, and what does it do?  

                      The factorial function will calculate the factorial of a number using async programming. The factorial of a non-negative integer n. It will be denoted as n! is the product of all positive integers from 1 to n. It is often calculated recursively or iteratively.  

                        

                      2. How can I use Python Asyncio to improve my program's performance?  

                      You can improve your program's performance by using Python's asyncio. This is useful for tasks that involve input and output. It lets you do many things at once without stopping the main process. 


                      Here are some steps to use asyncio effectively to enhance your program's performance: 

                      • Identify I/O-Bound Operations  
                      • Refactor Code with async/await  
                      • Use Non-Blocking Libraries  
                      • Leverage Concurrent Execution  

                        

                      3. How can we use async functions, and what do they do in programming?  

                      Async functions are a feature in programming languages. They allow code to run without blocking. The async keyword defines these functions. It contains the await keyword used to pause their execution during asynchronous operations. It allows other tasks to run concurrently.  

                        

                      4. Can the Python Asyncio library use context managers?  

                      Yes, you can use context managers with the Python asyncio library. Context managers are a valuable tool for managing resources. It ensures proper cleanup in both synchronous and asynchronous code. You can make your context managers or use existing ones in asyncio coroutines. 


                      Here's how you can work with context managers in asyncio:  

                      • Using Synchronous Context Managers  
                      • Creating Custom Asynchronous Context Managers  
                      • Using Existing Synchronous Context Managers  

                        

                      5. What examples of tasks can the Python standard library for asyncio perform?  

                      The Python standard library for asyncio has many tools and utilities. They help with doing different tasks at the same time. You can use the Python standard library for asyncio to perform various tasks. 

                      • Asynchronous I/O Operations  
                      • Creating Web Servers and Clients  
                      • Database Access  

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