Why is asynchronous execution of operations used in programming?

Asynchronous execution of operations in programming is used to improve the efficiency and responsiveness of applications. It allows long-running or blocking tasks (such as input/output, network requests, file operations) to be performed without blocking the main execution thread.

Main advantages of asynchrony:

• Improved performance through parallel task execution.
• Increased responsiveness of the user interface, as the main thread is not blocked.
• Ability to handle multiple operations simultaneously, such as multiple network connections.

In Python, asynchrony is implemented using the keywords async and await, as well as through libraries like asyncio.

Example:

import asyncio

async def fetch_data():
    print('Starting download')
    await asyncio.sleep(2)  # simulate a long operation
    print('Download complete')

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

asyncio.run(main())

In this example, two tasks run in parallel without blocking each other.