How to add a cooldown timer for commands - python-3.x

Question

I am very new to coding and want to just add a command timer to the code i got off the internet. I don't know how to do this and all the other codes I find are too much for me to know. I just want to be able to add around a 10 second cooldown timer to each command.
import discord
import asyncio
from discord.ext import commands
import datetime as DT
import discord.utils
class MyClient (discord.Client):
async def on_ready(self):
print('Logged in as')
print(self.user.name)
print(self.user.id)
print('------')
async def on_message(self, message):
# we do not want the bot to reply to itself
if message.author.id == self.user.id:
return
if message.content.startswith('!discord'): # I want to add a timer
channel = client.get_user(message.author.id)
await channel.send(''.format(message))
async def on_member_join(self, member):
guild = member.guild
if guild.system_channel is not None:
to_send = 'Welcome {0.mention} to {1.name}!'.format(member, guild)
await guild.system_channel.send(to_send)
client = MyClient()
client.run('')

Answer 1

The time.sleep() function, which another user suggested is a blocking call. Which means it will block the entire thread from being ran. I am not sure exactly how the Discord framework works, but I imagine thread blocking might be a problem.
A better solution I think would be to use asyncio, especially since you've already imported it. It will allow the program to do other stuff, while waiting the 10 seconds. Another Stackoverflow thread if you're interested
if message.content.startswith('!discord'):
channel = client.get_user(message.author.id)
await asyncio.sleep(10)
await channel.send(''.format(message))
Edit
You can save the last time the function was called, and check with an IF-statement if 10 seconds have passed since the last call.
class MyClient (discord.Client):
last_called = None
async def on_ready(self):
# other stuff
async def on_message(self, message):
# check if 10 seconds have passed since the last call
if MyClient.last_called and DT.datetime.now() < MyClient.last_called + DT.timedelta(seconds=10):
return
# we do not want the bot to reply to itself
if message.author.id == self.user.id:
return
if message.content.startswith('!discord'):
channel = client.get_user(message.author.id)
await channel.send(''.format(message))
MyClient.last_called = DT.datetime.now() # save the last call time

Answer 2

If you add this to the imports at the top of the file:
from time import sleep
then you can use the sleep() function to pause the script for a set number of seconds when execution reaches that line. So for instance, adding this:
sleep(10)
somewhere inside the functions would sleep for 10 seconds whenever the script reaches that line.