stopping a task discord.py

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I've made a Discord bot that loops a task every 15 minutes. I've got it working as intended but now I want to add a command that to stop and start the task. Here's part of my code:

class a(commands.Cog):
def __init__(self, client):
    self.client = client

    @tasks.loop(minutes=15.0)
    async def b(self):
        #do something
        
    b.start(self)
    
    @commands.command(pass_context=True)
    async def stopb(self, ctx):
        b.cancel(self)

def setup(client):
    client.add_cog(a(client))

When I use the command stopb an error is returned saying that that stopb is not defined. I've tried to change the indentation but then the error is that b is not defined. The code above is part of a cog. In my main file I have a command that can load and unload the cogs but this does not stop the task.

discord.py python
1 Answers

Rather than using the loop decorator, you could make your own task function and add it to the bot's loop. This way you can store the task object which has a cancel function.

class a(commands.Cog):
    def __init__(self, client):
        self.client = client
        self.task = self.client.loop.create_task(self.b())


    async def b(self):
        while True:
            #do something

            await asyncio.sleep(900)
            
    @commands.command(pass_context=True)
    async def stopb(self, ctx):
        self.task.cancel()


def setup(client):
    client.add_cog(a(client))
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