picamera_telegrambot.py is very simple script, which just sends a photo to a Telegram group from attached PiCamera. Of course the script must be run in a Raspberry Pi.

Read Raspberry Pi's documentation how to install and configure PiCamera.

Read Telegram's bot documentation how to create a bot and find its access token.

Create a Python3 virtuanenv, activate it and install required modules:

pip install -r requirements.txt -U

You can add token as an --token argument or in CAMBOT_TOKEN environment variable:

python picamera_telegrambot.py --token 123456789:asdfghjjklqwertyuiop123456

or

CAMBOT_TOKEN='123456789:asdfghjjklqwertyuiop123456' python picamera_telegrambot.py

You can test the script without Raspberry Pi and PiCamera if you install Pillow module.