Python asyncio: Running Waiting Tasks Concurrently Without Threads

A small shop checking stock with four suppliers illustrates the problem: doing each slow check in sequence wastes time while the program sits idle. The article explains that asyncio helps when work is dominated by waiting, such as network calls or database queries, but not when the work is CPU-bound. It also notes that asyncio requires async-compatible libraries, since a blocking call stalls the whole event loop. The author advises limiting concurrency for large numbers of tasks and using plain sequential code for simple one-off scripts. The example uses asyncio.gather with simulated delays to show that four waits finish in roughly the time of the longest one.