Debug: Python asyncio event loop already running

RuntimeError: This event loop is already running — happens when calling asyncio.run() inside Jupyter notebooks or already-async code.

Fixes depending on context:

1. In Jupyter notebooks:

# Option A: Use await directly (Jupyter has its own event loop)
result = await async_function()

# Option B: Use nest_asyncio
import nest_asyncio
nest_asyncio.apply()
asyncio.run(async_function()) # Now works

1. In already-async code:

# BAD: asyncio.run() inside async function
async def handler():
result = asyncio.run(other_async()) # ERROR!

# GOOD: just await it
async def handler():
result = await other_async()

1. In sync code calling async:

# If you need to call async from sync in a running loop:
import asyncio
loop = asyncio.get_event_loop()
future = asyncio.ensure_future(async_function())
result = loop.run_until_complete(future) # Only if loop not running

1. Thread-safe from sync context:

loop = asyncio.get_running_loop()
future = asyncio.run_coroutine_threadsafe(coro, loop)
result = future.result(timeout=30)