discord py get user by id

1user = bot.get_user(user_id)

1username = client.get_user(user_id)

1user = await bot.fetch_user(payload.user_id)

1id = message.author.id
2await message.channel.send("<@"+str(id)+"> Mentioned you!")

1#Another way to do it as a simpler way with discord.py:
2#(This is a command for showing the author of the message's ID)
3id = message.author.id
4if message.content.startswith("!whatismyid"):
5  await message.channel.send("Your ID is: "+str(id))