What is the asyncio.TaskGroup?

Question

Accepted Answer

**TaskGroup** manages a **set of tasks** with automatic cleanup.

```python
import asyncio

async def fetch(url):
    await asyncio.sleep(1)
    return f"Data from {url}"

async def main():
    # Python 3.11+
    async with asyncio.TaskGroup() as tg:
        task1 = tg.create_task(fetch("url1"))
        task2 = tg.create_task(fetch("url2"))
        task3 = tg.create_task(fetch("url3"))

# All tasks completed
    print(task1.result())
    print(task2.result())
    print(task3.result())

# With error handling
async def unreliable_fetch(url):
    await asyncio.sleep(1)
    if "error" in url:
        raise ValueError(f"Failed: {url}")
    return f"Data from {url}"

async def main_with_errors():
    try:
        async with asyncio.TaskGroup() as tg:
            task1 = tg.create_task(unreliable_fetch("url1"))
            task2 = tg.create_task(unreliable_fetch("error"))
    except* ValueError as eg:
        for exc in eg.exceptions:
            print(f"Error: {exc}")

asyncio.run(main())
```

**Benefits:**
- Automatic task cancellation on error.
- Clean exception handling.
- Structured concurrency.

Python: What is the asyncio.TaskGroup?