async / await

Concurrent code without threads.

Define a coroutine with async def. Use await to pause for another coroutine. In Pyodide the event loop is already running, so you can await at the top level instead of calling asyncio.run().

import asyncio

async def hello():
    await asyncio.sleep(0)
    return "done"

print(await hello())

main.py

Output

Press Run to execute.

Expected output

[2, 4, 6]