What are some examples of async functions in Python 3.10?

What are some examples of async functions in Python 3.10?

In Python 3.10, async functions allow you to write asynchronous code using the 'async' and 'await' keywords. Here are a few examples:

1. Basic Async Function:

   import asyncio
   
   async def say_hello():
       await asyncio.sleep(1)
       return 'Hello!'
   

2. Async with Multiple Tasks:

   async def main():
       task1 = asyncio.create_task(say_hello())
       task2 = asyncio.create_task(say_hello())
       await task1
       await task2
   

3. Async with HTTP Requests:

   import aiohttp
   
   async def fetch_data(url):
       async with aiohttp.ClientSession() as session:
           async with session.get(url) as response:
               return await response.json()
   

Would you like to see more examples or details on a specific use case?

Can you explain the difference between async and threading?

Sure! The main difference is that async functions are designed for I/O-bound tasks, allowing you to run other code while waiting for I/O operations to complete. Threading, on the other hand, is more suited for CPU-bound tasks, where multiple threads can run in parallel. Async is generally more efficient for tasks like web requests, while threading can be better for tasks that require heavy computation.

What are some common use cases for async functions?

Common use cases for async functions include:

1. Web scraping or making multiple API calls simultaneously.
2. Handling multiple client connections in web servers.
3. Performing database operations without blocking the main thread.
4. Any scenario where you need to wait for I/O operations, like file reading/writing.

How do I handle exceptions in async functions?

You can handle exceptions in async functions using try-except blocks just like in synchronous code. Here's an example:

async def risky_function():
    try:
        await some_async_operation()
    except SomeException as e:
        print(f'An error occurred: {e}')