In what situations is it advisable to use asynchronous calls in Python?

Asynchronous calls in Python are advisable in situations where the program performs input-output operations that may take a significant amount of time, such as:

• Network requests (HTTP, databases).
• Reading/writing files.
• Interacting with external services.

Asynchrony allows not to block the main execution thread, efficiently using waiting time and increasing performance.

Example using asyncio:

import asyncio

async def fetch_data():
    await asyncio.sleep(1)  # simulate network request
    return 'data'

async def main():
    result = await fetch_data()
    print(result)

asyncio.run(main())

Thus, asynchrony is useful where there are delay operations, and it is necessary to improve responsiveness or throughput of the application.