What are some examples of async context managers in Python?

Can you explain what async context managers are in Python?

Sure! Async context managers are used to manage resources asynchronously, allowing for cleaner code when dealing with asynchronous operations.

Can you give me an example of how to use an async context manager?

Absolutely! Here's a simple example using asyncio and an async context manager to open a file:

import asyncio

class AsyncFile:
    def __init__(self, filename):
        self.filename = filename

    async def __aenter__(self):
        self.file = await asyncio.to_thread(open, self.filename, 'r')
        return self.file

    async def __aexit__(self, exc_type, exc_val, exc_tb):
        await asyncio.to_thread(self.file.close)

async def read_file():
    async with AsyncFile('example.txt') as f:
        content = await asyncio.to_thread(f.read)
        print(content)

asyncio.run(read_file())

What happens if an error occurs while using the async context manager?

If an error occurs, the __aexit__ method is still called, allowing you to handle the exception gracefully. You can manage cleanup or logging there.