How to run an asynchronous task later in Python?

Question

I am using discord.py async version and I need to assign a role 10.5 minutes after a user joins a server. I was considering using threading.Timer(..) but member.add_roles(...) is a coroutine and therefore Timer will not await it.

I tried an alternate method using loop.call_later(...) but in my testing I get a RuntimeWarning that my coroutine to add roles, add_roles, was never waiting. Here's what I tried so far:

import discord, asyncio
from discord.utils import get

client = discord.Client()

async def on_member_join(member):
    ...
    newuser, noparty = get(member.guild.roles, name="New Member"), get(member.guild.roles, name="No Party")
    async def add_roles(member, newuser, noparty):
        await member.add_roles(newuser, noparty, reason="Auto-role new users.")
    loop = asyncio.get_event_loop()
    loop.call_later(630, add_roles, member, newuser, noparty)

The expected outcome is that after 10.5 minutes the member will be assigned the New User and No Party roles, but instead I get the RuntimeWarning described above. My questions are: is this the proper approach? Or can I simply use asyncio.sleep(630) since the rest of my program is async functions? Any help is appreciated.

psidex · Accepted Answer · 2019-08-31 21:12:44Z

3

await asyncio.sleep(630)

Should work just fine.

If you have other things that you want to do inside on_member_join that you don't want to wait 10 minutes for, you could set it up to run it as an asyncio task

async def give_permission_later(member, newuser, noparty):
    await asyncio.sleep(630)
    await member.add_roles(newuser, noparty, reason="Auto-role new users.")

async def on_member_join(member):
    ...
    newuser, noparty = get(member.guild.roles, name="New Member"), get(member.guild.roles, name="No Party")
    client.loop.create_task(give_permission_later(member, newuser, noparty))
    # More code that should execute now

edited Aug 31, 2019 at 21:12

answered Aug 31, 2019 at 21:11

psidex

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2 Comments

FunBot Over a year ago

Okay, since that's my last task I'll try that. Thanks!

psidex Over a year ago

To expand on that, calling asyncio.sleep is basically saying to the interpreter "come back to me in x amount of time", instead of normal time.sleep, which is basically "don't do anything else until x amount of time has passed"

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