Threads vs processes vs asyncio: when to use each

# ======================================================================
# Q: Threads vs processes vs asyncio: when to use each?
#
# Threads: I/O-bound work with blocking libraries (e.g. 20 HTTP calls with
# requests via ThreadPoolExecutor). Processes: CPU-bound work (calculations,
# images), to bypass the GIL. asyncio: thousands of concurrent I/O connections
# (WebSockets, many external APIs) with async libraries (httpx, asyncpg).
# ======================================================================

from concurrent.futures import ThreadPoolExecutor

with ThreadPoolExecutor(max_workers=10) as pool:
    prices = list(pool.map(fetch_supplier_price, supplier_urls))