What are some examples of error handling in Python's async functions?

What are some examples of error handling in Python's async functions?

In Python, you can handle errors in async functions using try-except blocks. For example:

import asyncio

async def risky_function():
    raise ValueError('An error occurred!')

async def main():
    try:
        await risky_function()
    except ValueError as e:
        print(f'Caught an error: {e}')

asyncio.run(main())

Can you explain how the try-except block works in this context?

Sure! The try-except block allows you to catch exceptions that occur within the try block. If an exception is raised, the control is transferred to the except block, where you can handle the error gracefully.

Are there any other methods for handling errors in async functions?

Yes, you can also use the asyncio library's built-in error handling features, such as asyncio.gather() with return_exceptions=True, which collects exceptions without stopping the execution of other tasks.

Can you provide an example using asyncio.gather?

Certainly! Here's an example:

async def task1():
    raise ValueError('Error in task1')

async def task2():
    return 'Task 2 completed'

async def main():
    results = await asyncio.gather(task1(), task2(), return_exceptions=True)
    print(results)  # Output: [ValueError, 'Task 2 completed']

asyncio.run(main())