[FIXED] How to make a timer command in discord.py?

Issue

I want to make a timer command.

    @commands.command()
    async def timer(self, ctx, seconds):
        try:
            secondint = int(seconds)
            if secondint > 300:
                await ctx.send("I dont think im allowed to do go above 300 seconds.")
                raise BaseException
            if secondint < 0 or secondint == 0:
                await ctx.send("I dont think im allowed to do negatives")
                raise BaseException
            message = await ctx.send("Timer: " + seconds)
            while True:
                secondint = secondint - 1
                if secondint == 0:
                    await message.edit(new_content=("Ended!"))
                    break
                await message.edit(new_content=("Timer: {0}".format(secondint)))
                await asyncio.sleep(1)
            await ctx.send(ctx.message.author.mention + " Your countdown Has ended!")
        except ValueError:
            await ctx.send("Must be a number!")

I tried this but this doesn't work , it doesn't edit message like I want it to and no errors.

Solution

It doesn't edit the message since new_content isn't a Message.edit() method argument.
It only has: content / embed / suppress / delete_after / allowed_mentions.

The one you're looking for is content:

@commands.command()
async def timer(self, ctx, seconds):
    try:
        secondint = int(seconds)
        if secondint > 300:
            await ctx.send("I dont think im allowed to do go above 300 seconds.")
            raise BaseException
        if secondint <= 0:
            await ctx.send("I dont think im allowed to do negatives")
            raise BaseException
        message = await ctx.send("Timer: {seconds}")
        while True:
            secondint -= 1
            if secondint == 0:
                await message.edit(content="Ended!")
                break
            await message.edit(content=f"Timer: {secondint}")
            await asyncio.sleep(1)
        await ctx.send(f"{ctx.author.mention} Your countdown Has ended!")
    except ValueError:
        await ctx.send("Must be a number!")

Answered By - MrSpaar