How to connect a Ton wallet to telegram through a bot conversation, is there any tool or api for that ?

github.com/ton-connect

Can I use it under python ?

not directly, but it's a standard and you can implement it in python

https://github.com/stspbu/ton-connect

Here lib for ton connect on python, but if I'm not mistaken it already became legacy and isn't work as stable as TS library can.