How to determine that a person has deleted a bot?

Question

Python

TELEBOT
There is a mailing list, the list of user ids is stored in a db file, in addition to the mailing list, I look through it the number of people in the bot
, how can we delete user ids that have blocked the bot?
there seems to be a 403 error, but how to implement it?
something like:

if( error 403 ):
delete id

Answer 1

You take and ban the bot yourself and try to send a message to yourself with a script. You look at what arrives in response and make up the necessary condition in the if.
Then you send a mailing to the user base and by this condition you understand who deleted the bot.
That's all.