What are some examples of asynchronous programming in Python?

What are some examples of asynchronous programming in Python?

Asynchronous programming in Python allows you to run tasks concurrently. Here are a few examples: 1. Using asyncio for managing I/O-bound tasks. 2. Making asynchronous HTTP requests with aiohttp. 3. Running background tasks with asyncio.create_task.

Can you show me a simple code example using asyncio?

Sure! Here's a simple example:

import asyncio

async def say_hello():
    print('Hello')
    await asyncio.sleep(1)
    print('World!')

async def main():
    await say_hello()

asyncio.run(main())

What about using aiohttp for making requests?

Here's a basic example using aiohttp:

import aiohttp
import asyncio

async def fetch(url):
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as response:
            return await response.text()

async def main():
    html = await fetch('https://example.com')
    print(html)

asyncio.run(main())

How does error handling work in asynchronous code?

In asynchronous code, you can use try-except blocks just like in synchronous code. For example:

async def safe_fetch(url):
    try:
        return await fetch(url)
    except Exception as e:
        print(f'Error: {e}')