ASCIIMath to PNG Discord bot

mathbot.py

import discord # discord.py==2.3.2

import matplotlib.pyplot as plt # matplotlib==3.9.0

from dotenv import load_dotenv # python-dotenv==1.0.1
from os     import getenv, remove

from py_asciimath.translator.translator import ASCIIMath2Tex # py-asciimath==0.3.0
from discord.ext                        import commands

load_dotenv()

TOKEN:      str = getenv("TOKEN") # stored in .env file
CMD_PREFIX: str = "!"

def ASCIIMath2PNG(expr: str, filename: str = "output.png") -> None:
    parser = ASCIIMath2Tex(log=False, inplace=True)
    output = "$"+parser.translate(expr.strip(), displaystyle=True, from_file=False, pprint=False)[2:-2]+"$"
    fig = plt.figure(figsize=(3, 0.5))
    text = fig.text(x=0.5, y=0.5, s=output, horizontalalignment="center", verticalalignment="center", fontsize=16)
    plt.savefig(filename)

intents: discord.Intents = discord.Intents.default()
intents.message_content = True

bot: commands.Bot = commands.Bot(command_prefix=CMD_PREFIX, intents=intents)

@bot.event
async def on_ready() -> None:
    print(f"Logged in as {bot.user}")

@bot.command(name="math")
async def cmd_math(ctx: commands.Context, *, expr: str) -> None:
    async with ctx.channel.typing():
        ASCIIMath2PNG(expr)
        file = discord.File("./output.png")
    await ctx.reply(file=file)
    remove("./output.png")
    print(len(expr))

@cmd_math.error
async def error_math(ctx: commands.Context, err) -> None:
    if isinstance(err, commands.MissingRequiredArgument):
        await ctx.reply("Usage: !math `[expression]`\n[Syntax](https://asciimath.org/)")

if __name__ == "__main__":
    bot.run(TOKEN)