python-telegram-bot/examples/timerbot.py

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#!/usr/bin/env python
# pylint: disable=unused-argument
# This program is dedicated to the public domain under the CC0 license.
"""
Simple Bot to send timed Telegram messages.
This Bot uses the Application class to handle the bot and the JobQueue to send
timed messages.
First, a few handler functions are defined. Then, those functions are passed to
the Application and registered at their respective places.
Then, the bot is started and runs until we press Ctrl-C on the command line.
Usage:
Basic Alarm Bot example, sends a message after a set time.
Press Ctrl-C on the command line or send a signal to the process to stop the
bot.
"""
import logging
Context based callbacks (#1100) See https://github.com/python-telegram-bot/python-telegram-bot/wiki/Transition-guide-to-Version-11.0 under Context based callbacks and Filters in handlers for a good guide on the changes in this commit. * Change handlers so context is supported * Attempt to make parameter "guessing" work on py < 3.5 * Document use_context in all handlers * Add Context to docs * Minor fixes to context handling * Add tests for context stuff * Allow the signature check to work on py<3.5 with methods * Fix order of operations * Address most issues raised in CR * Make CommandHandler no longer support filter lists * Fix indent (pycharm can be an arse sometimes) * Improve readability in conversationhandler * Make context have Match instead of groups & groupdict * Remove filter list support from messagehandler too * Small fix to StringCommandHandler * More small fixes to handlers * Amend CHANGES * Fix tests and fix bugs raised by tests * Don't allow users to ignore errors without messing with the warning filters themselves * Ignore our own deprecation warnings when testing * Skipping deprecationwarning test on py2 * Forgot some changes * Handler: Improved documentation and text of deprecation warnings * HandlerContext: Keep only dispatcher and use properties; improved doc * Complete fixing the documentation. - Fixes per Eldinnie's comments. - Fixes per warnings when running sphinx. * Some small doc fixes (interlinks and optionals) * Change add_error_handler to use HandlerContext too * More context based changes Context Based Handlers -> Context Based Callbacks No longer use_context args on every single Handler Instead set dispatcher/updater .use_context=True to use Works with - Handler callbacks - Error handler callbacks - Job callbacks Change examples to context based callbacks so new users are not confused Rename and move the context object from Handlers.HandlerContext to CallbackContext, since it doesn't only apply to handlers anymore. Fix tests by adding a new fixture `cpd` which is a dispatcher with use_context=True * Forgot about conversationhandler * Forgot jobqueue * Add tests for callbackcontext & for context based callback job * Fix as per review :)
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from telegram import Update
from telegram.ext import Application, CallbackContext, CommandHandler
# Enable logging
logging.basicConfig(
format="%(asctime)s - %(name)s - %(levelname)s - %(message)s", level=logging.INFO
)
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# Define a few command handlers. These usually take the two arguments update and
# context.
# Best practice would be to replace context with an underscore,
# since context is an unused local variable.
# This being an example and not having context present confusing beginners,
# we decided to have it present as context.
async def start(update: Update, context: CallbackContext.DEFAULT_TYPE) -> None:
"""Sends explanation on how to use the bot."""
await update.message.reply_text("Hi! Use /set <seconds> to set a timer")
async def alarm(context: CallbackContext.DEFAULT_TYPE) -> None:
"""Send the alarm message."""
job = context.job
await context.bot.send_message(job.chat_id, text=f"Beep! {job.context} seconds are over!")
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def remove_job_if_exists(name: str, context: CallbackContext.DEFAULT_TYPE) -> bool:
"""Remove job with given name. Returns whether job was removed."""
current_jobs = context.job_queue.get_jobs_by_name(name)
if not current_jobs:
return False
for job in current_jobs:
job.schedule_removal()
return True
async def set_timer(update: Update, context: CallbackContext.DEFAULT_TYPE) -> None:
"""Add a job to the queue."""
chat_id = update.effective_message.chat_id
try:
# args[0] should contain the time for the timer in seconds
due = int(context.args[0])
if due < 0:
await update.message.reply_text("Sorry we can not go back to future!")
return
job_removed = remove_job_if_exists(str(chat_id), context)
context.job_queue.run_once(alarm, due, chat_id=chat_id, name=str(chat_id), context=due)
text = "Timer successfully set!"
if job_removed:
text += " Old one was removed."
await update.message.reply_text(text)
except (IndexError, ValueError):
await update.effective_message.reply_text("Usage: /set <seconds>")
async def unset(update: Update, context: CallbackContext.DEFAULT_TYPE) -> None:
"""Remove the job if the user changed their mind."""
chat_id = update.message.chat_id
job_removed = remove_job_if_exists(str(chat_id), context)
text = "Timer successfully cancelled!" if job_removed else "You have no active timer."
await update.message.reply_text(text)
def main() -> None:
"""Run bot."""
# Create the Application and pass it your bot's token.
application = Application.builder().token("TOKEN").build()
# on different commands - answer in Telegram
application.add_handler(CommandHandler(["start", "help"], start))
application.add_handler(CommandHandler("set", set_timer))
application.add_handler(CommandHandler("unset", unset))
# Run the bot until the user presses Ctrl-C
application.run_polling()
if __name__ == "__main__":
main()