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How to Perform Asynchronous Programming with asyncio

Posted by Kosal

How to Perform Asynchronous Programming with asyncio

Asynchronous programming with asyncio in Python allows you to write concurrent code that can handle multiple tasks concurrently, making it particularly useful for I/O-bound operations like web scraping, network requests, and working with databases. Here's a basic guide on how to perform asynchronous programming with asyncio:

1. Import asyncio:

Start by importing the asyncio library.

import asyncio

2. Define Asynchronous Functions:

Write functions using the async def syntax to define asynchronous functions. Inside these functions, you can use await to pause execution and wait for asynchronous operations to complete.

async def my_async_function():
    # Perform some asynchronous operation
    await asyncio.sleep(1)
    print("Async operation completed")

3. Run Asynchronous Functions Concurrently:

You can run multiple asynchronous functions concurrently using asyncio.gather() or by creating tasks.

  • Using asyncio.gather():
async def main():
    await asyncio.gather(
        my_async_function(),
        my_async_function(),
        my_async_function()
    )

asyncio.run(main())
  • Using tasks:
async def main():
    task1 = asyncio.create_task(my_async_function())
    task2 = asyncio.create_task(my_async_function())
    task3 = asyncio.create_task(my_async_function())

    await task1
    await task2
    await task3

asyncio.run(main())

4. Awaiting Asynchronous Operations:

Use await to wait for asynchronous operations to complete. This allows other tasks to run concurrently while waiting for I/O-bound operations.

async def main():
    print("Starting...")
    await my_async_function()
    print("Async operation finished")

asyncio.run(main())

5. Handling Exceptions:

You can handle exceptions within asynchronous code using try-except blocks or asyncio's built-in exception handling.

async def my_async_function():
    try:
        # Perform some asynchronous operation
        await asyncio.sleep(1)
        print("Async operation completed")
    except Exception as e:
        print(f"An error occurred: {e}")

async def main():
    try:
        await my_async_function()
    except Exception as e:
        print(f"An error occurred in main: {e}")

asyncio.run(main())

This is a basic overview of how to perform asynchronous programming with asyncio in Python. Asynchronous programming can significantly improve the efficiency of I/O-bound applications by allowing them to perform other tasks while waiting for I/O operations to complete.

#python