What is asyncio event loop?

Question

Accepted Answer

**Event Loop** is a loop for processing **asynchronous tasks**.

```python
import asyncio

# Tasks
async def task1():
    await asyncio.sleep(2)
    return "Task 1"

async def task2():
    await asyncio.sleep(1)
    return "Task 2"

# Parallel execution
async def main():
    # gather — all tasks
    results = await asyncio.gather(task1(), task2())
    print(results)  # ["Task 1", "Task 2"]

# wait_for — with timeout
    try:
        result = await asyncio.wait_for(task1(), timeout=1.0)
    except asyncio.TimeoutError:
        print("Timeout!")

# as_completed — as they complete
    tasks = [task1(), task2()]
    for coro in asyncio.as_completed(tasks):
        result = await coro
        print(f"Completed: {result}")

asyncio.run(main())
```

**Loop methods:**
- create_task — start task.
- call_later — delayed execution.
- run_in_executor — in separate thread.

Python: What is asyncio event loop?