CODE EXAMPLE FOR PYTHON

discord.py send message to channel with mutiple id

@bot.command(pass_context=True)
async def ping(ctx):
    channels_to_send = ["1234567890", "234567890"]
    for channel_id in channels_to_send:
        channel = bot.get_channel(channel_id)
        await bot.send_message(channel, "Pong")