What is the gather() function?.

asyncio.gather() combines the results of multiple asynchronous objects (coroutines, tasks) and returns an iterator or a single result after all objects have completed. This is useful for running independent asynchronous operations in parallel.

Key features:

• Concurrent execution: Runs all passed objects simultaneously.
• Order preservation: The order of results corresponds to the order of the passed objects.
• Exception handling: By default, if any object raises an exception, gather() propagates it. The return_exceptions=True parameter allows collecting exceptions into a list of results instead of stopping execution.
• Input types: Accepts an iterable (list, tuple, etc.) of asynchronous objects.

Applications:

• Parallel data loading from different sources.
• Executing multiple independent network requests.
• Handling multiple tasks that can run concurrently.

import asyncio

async def task1():
    await asyncio.sleep(1)
    return "Result 1"

async def task2():
    await asyncio.sleep(2)
    return "Result 2"

async def main():
    results = await asyncio.gather(task1(), task2())
    print(results) # Will output ['Result 1', 'Result 2']

asyncio.run(main())