from telegram.ext import Updater, CommandHandler

def func(update, context):
    # write your own logic here
    update.message.reply_text("Write your func below ")
    # write your code here

def main():
    updater = Updater(TOKEN, use_context=True)  # he will define TOKEN himself
    dp = updater.dispatcher

    dp.add_handler(CommandHandler("func", func))

    updater.start_polling()
    updater.idle()

if __name__ == "__main__":
    main()