Telegram python check key value from JSON

Question

i'm creating a telegram bot using pyhton, specifically the following module

https://github.com/python-telegram-bot/python-telegram-bot

What i want to do is:

• send input to the bot
• read the update object to analyze each field
• check if 'text' key is present
• do something if yes

My current python implementation:

def echo(update: Update, context: CallbackContext) -> None:
    if 'text' in update.message:
        update.message.reply_text('I found your key value you are looking for')
    else:
        update.message.reply_text('Key not found')

def main():
    """Start the bot."""
    # Create the Updater and pass it your bot's token.
    updater = Updater(MY_TOKEN)

    # Get the dispatcher to register handlers
    dispatcher = updater.dispatcher
    dispatcher.add_handler(MessageHandler(Filters.text & ~Filters.command, echo))

    updater.start_polling()
    updater.idle()


if __name__ == '__main__':
    main()

Structure of update object:

{
   "update_id":id_update,
   "message":{
      "message_id":1579,
      "date":1615193338,
      "chat":{
         "id":id_chat,
         "type":"private",
         "username":"XXX",
         "first_name":"XXX"
      },
      "text":"Hello Bot",
      "entities":[
         
      ],
      "caption_entities":[
         
      ],
      "photo":[
         
      ],
      "new_chat_members":[
         
      ],
      "new_chat_photo":[
         
      ],
      "delete_chat_photo":false,
      "group_chat_created":false,
      "supergroup_chat_created":false,
      "channel_chat_created":false,
      "from":{
         "id":id_chat,
         "first_name":"xxx",
         "is_bot":false,
         "username":"xxx",
         "language_code":"it"
      }
   }
}

When i test it i didn't get any output from the bot, it seems like it is ignoring the if/else condition. If i print the update.message.text i see correctly the input sent to the bot.

Thank you all

EDIT

I found the solution, i had to change the filter passed to MessageHandler in this way

dispatcher.add_handler(MessageHandler(Filters.all, echo))

Thanks anyway for the help

Answer 1

Your edit is very likely not the actual solution. Using Filters.all instead of Filters.text & ~Filters.command just says that the MessageHandler will catch any message and not just messages that contain text and don't start with a botcommand.

The problem rather is that 'text' in update.message can't work as update.message is a telegram.Message object and not iterable. Therefore 'text' in update.message will probably throw an error, which you don't see as you have neither logging enabled nor an error handler registered (see the PTB readme and wiki, respectively for info on logging & error handlers).

My guess is that changing to 'text' in update.message.text should do the trick.