import random

import discord
from discord.ext import commands


class MyContext(commands.Context):
    async def tick(self, value):
        # reacts to the message with an emoji
        # depending on whether value is True or False
        # if its True, it'll add a green check mark
        # otherwise, it'll add a red cross mark
        emoji = '\N{WHITE HEAVY CHECK MARK}' if value else '\N{CROSS MARK}'
        try:
            # this will react to the command author's message
            await self.message.add_reaction(emoji)
        except discord.HTTPException:
            # sometimes errors occur during this, for example
            # maybe you dont have permission to do that
            # we dont mind, so we can just ignore them
            pass


class MyBot(commands.Bot):
    async def get_context(self, message, *, cls=MyContext):
        # when you override this method, you pass your new Context
        # subclass to the super() method, which tells the bot to
        # use the new MyContext class
        return await super().get_context(message, cls=cls)
        

bot = MyBot(command_prefix='!')

@bot.command()
async def guess(ctx, number: int):
    """ Guess a random number from 1 to 6. """
    # explained in a previous example, this gives you
    # a random number from 1-6
    value = random.randint(1, 6)
    # with your new helper function, you can add a
    # green check mark if the guess was correct,
    # or a red cross mark if it wasnt
    await ctx.tick(number == value)

# important: you shouldnt hard code your token
# these are very important, and leaking them can 
# let people do very malicious things with your
# bot. try to use a file or something to keep
# them private, and dont commit it to GitHub
token = "your token here"
bot.run(token)

Add example on subclassing commands.Context
Add example on subclassing commands.Context
