When is it preferable to use asynchronous operations instead of threads for executing tasks?

Asynchronous operations are preferred when you need to efficiently handle a large number of input/output tasks (such as network requests, file operations) without blocking the main thread of execution. In such cases, asynchrony allows the system to continue working while waiting for the operation to complete.

Threads, on the other hand, are better suited for tasks that require parallel execution of computations on multiple CPU cores.

An example of using asynchronous code in Python with asyncio:

import asyncio

async def fetch_data():
    print('Starting download')
    await asyncio.sleep(2)  # simulate network request
    print('Download complete')

async def main():
    await asyncio.gather(fetch_data(), fetch_data())

asyncio.run(main())

Here, two operations are performed asynchronously, without blocking each other.