如何永远运行 2 个异步函数？

Question

I'm trying to run 2 async functions forever. Can someone help me? My code and error message is provided below.

Code:

import websockets
import asyncio
import json
import time

async def time(loop):
    while True:
        millis = await int(round(time.time() * 1000))
        print(millis)
        await asyncio.sleep(0.001)

async def stream(loop):
    async with websockets.connect('wss://www.bitmex.com/realtime?subscribe=trade:XBTUSD') 
                    as websocket:
        while True:
            try:
                data = await websocket.recv()
                data = json.loads(data)
                print(data['data'][-1]['price'])
            except KeyError:
                pass
            except TypeError:
                pass

loop = asyncio.get_event_loop()

async def main():
    await asyncio.gather(loop.run_until_complete(stream(loop)), 
                         loop.run_until_complete(time(loop)))

if __name__ == "__main__":
    asyncio.run(main())

Error:

Exception has occurred: RuntimeError
Cannot run the event loop while another loop is running

Answer 1

Well, there are few errors with your snippet code:

1. You can't name your first function as time because it'll generate a conflict with time built-in function
2. Why are you passing loop as parameter if you're not gonna use it? It's useless.
3. You can't await a function if it's not awaitable ie int is a synchronous built-in method.

Making the proper corrections it'll be something like this:

import websockets
import asyncio
import json
import time

async def another_name():
    while True:
        millis = int(round(time.time() * 1000))
        print(millis)
        await asyncio.sleep(0.001)

async def stream():
    async with websockets.connect('wss://www.bitmex.com/realtime?subscribe=trade:XBTUSD') 
                    as websocket:
        while True:
            try:
                data = await websocket.recv()
                data = json.loads(data)
                print(data['data'][-1]['price'])
            except KeyError:
                pass
            except TypeError:
                pass
            await asyncio.sleep(0.001) #Added

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    coros = []
    coros.append(another_name())
    coros.append(stream())
    loop.run_until_complete(asyncio.gather(*coros))

The line await asyncio.sleep(0.001) in stream() function is compulsory otherwise it won't never let the another_name() function runs.