Unable to pass args to context.job_queue.run_once in Python Telegram bot API

Question

In the following code how can we pass the context.args and context to another function, in this case callback_search_msgs

def search_msgs(update, context):
    print('In TG, args', context.args)
    context.job_queue.run_once(callback_search_msgs, 1, context=context, job_kwargs={'keys': context.args})

def callback_search_msgs(context, keys):
    print('Args', keys)
    chat_id = context.job.context
    print('Chat ID ', chat_id)

def main():
    updater = Updater(token, use_context=True)
    dp = updater.dispatcher
    dp.add_handler(CommandHandler("search_msgs",search_msgs, pass_job_queue=True,
                                  pass_user_data=True))

    updater.start_polling()
    updater.idle()


if __name__ == '__main__':
    main()

score 5 · Accepted Answer · answered Jun 15 '21 at 18:39

A few notes:

job callbacks accept exactly one argument of type CallbackContext. Not two.
the job_kwargs parameter is used to pass keywoard argument to the APScheduler backend, on which JobQueue is built. The way you're trying to use it doesn't work.
if you want to know only the chat_id in the job, you don't have to pass the whole context argument of search_msgs. Just do context.job_queue.run_once(..., context=chat_id,...)
if you want to pass both the chat_id and context.args you can e.g. pass them as tuple:
```
job_queue.run_once(..., context=(chat_id, context.args), ...)
```
and then retrieve them in the job via chat_id, args = context.job.context.
Since you're using use_context=True (which is the default in v13+, btw), the pass_* parameters of CommandHandler (or any other handler) have no effect at all.

I suggest to carefully read

The tutorial on JobQueue
The example on JobQueue
The docs of JobQueue

Disclaimer: I'm currently the maintainer of python-telegram-bot

Unable to pass args to context.job_queue.run_once in Python Telegram bot API

1 Answers1