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Mocking Trio's open_nursery and spawn with asyncio.TaskGroup

Show how to mock Trio's nursery pattern using Python's asyncio.TaskGroup to simulate task spawning and completion.

import asyncio

class MockSpawner:
    async def spawn(self, nursery):
        print("Spawning mock task...")
        await asyncio.sleep(1)
        print("Mock task completed")

async def open_nursery():
    async with asyncio.TaskGroup() as nursery:
        mock = MockSpawner()
        nursery.create_task(mock.spawn…

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