Updating variable every 24 hours

I’m trying to add 1 to a variable every (2 seconds for this example). Problem is, the variable only ever updates to 1. Am I overlooking something?

Code:

import discord
from discord.ext import commands, tasks


countvar = 0 # Var defined.

@bot.event
async def on_ready():
    counter.start(countvar) # loop started

@tasks.loop(seconds=2)
async def counter(countvar):
    countvar += 1 # every 2 seconds add 1 to var
    print(f'countvar + 1 ({countvar})')

Output:

countvar + 1 (1)
countvar + 1 (1)
countvar + 1 (1)

Expected Result:

countvar + 1 (1)
countvar + 1 (2)
countvar + 1 (3)

>Solution :

Use global keyword to modify the global copy of your variable.

async def counter(countvar):
    global countvar
    countvar += 1 # every 2 seconds add 1 to var