How make a dice bot in discord.py

Question

I'm trying to create a command for my discord bot to roll dice, but I can't think of a way to allow this command to let me add a value to the roll. Example: 3d20+8

@bot.command()
  async def d(ctx,number):
      variable=random.randint(1,int(number)) 
      await ctx.reply(f"` {variable} ` ⟵ [{variable}] 1d{numero}")

Does anyone know how I would accomplish this?

Answer 1

You can do something like this.

For readability, I made the first dice function unpack the input (because it's in the format XdY+Z). Then it goes to the second function _dice which does all the processing.

@client.command()
async def dice(ctx, *, text: str):
    count, _, text = text.partition('d')  # eg "12d34+56" -> "12", "d", "34+56"
    size, _, offset = text.partition('+')  # eg "34+56" -> "34", "+", "56"
    try:
        count = int(count)
        size = int(size)
        offset = int(offset)
    except ValueError:
        raise commands.BadArgument('bad formatting of dice value')
    return await _dice(ctx, count, size, offset)

async def _dice(ctx, count, size, offset):
    rolls = [random.randint(offset+1, offset+size) for i in range(count)]  # eg for 20 with offset 3, generate values 4 to 23
    embed = discord.Embed(title=f'Dice for {count}d{size}+{offset}')
    embed.description = '\n'.join((f'#{i}: **{roll}**' for i, roll in enumerate(rolls)))
    embed.add_field(name='sum', value=f'total = {sum(rolls)}')
    await ctx.send(embed=embed)

---

Output:

In the above you can see that d10+10 outputs values in the range [11,20], which is 10 offset from the default [1,10].

Answer 2

I am not familiar with discord.py in particular, but here is how I would do it in a normal file

import random
user_input = input("Input dice size and how many (ex. 3d6)") #here you wouldn't be asking for input, just reading it off the server
dice_number = int(user_input.split("d")[0])
dice_add = int(user_input.split("+")[1])
print(dice_add)
dice_sides = int(user_input.strip(str(dice_number)).strip(str(dice_add)).strip("d").strip("+"))
total_number = 0
for i in range(dice_number):
  total_number += random.randint(1, dice_sides)
total_number += dice_add
print(total_number)

total_number = 0
for i in range(dice_number):
  total_number += random.randint(1, dice_sides)
total_number += int(dice[2])
print(total_number)

in the case you want to subtract as well, just make the input something like 4d12+-6 for a -6 modifier

Answer 3

Here's how I would write it:

import random
import re

from discord.ext import commands

# ...

@bot.command()
async def roll(ctx: commands.Context, cmd: str):
    num, sides, offset = map(lambda s: int(s), re.split(r"[d+]+", user_input))
    total = sum(random.randint(1, sides) for _ in range(num)) + offset
    # do what you want with the total

Now, there is a bit going on here, so I'll try to break it down.

• re.split(r"[d+]+") takes our user_input and splits it at one or more delimiters: 'd' and '+'.
• map takes these split values and converts them all to ints.
• The sum section is a more Pythonic way of doing the same action num times and adding up the results. We add the offset back on at the end.

I don't really understand what you're trying to achieve with the format, so I'm going to leave that up to you.