Entering an image into a form on a website (Python)

There is a website with license plate recognition: https://www.doubango.org/webapps/alpr/

I want to write a code that will accept an image with a car number as input, process it, give a number in the form of a text.

How can I refer to the form for receiving images on the site, which libraries to use for convenience. I already understand that requests, but how exactly I can not understand. I have already read so much information about post, get, but there is no understanding of how to apply the picture to the form.