Bottle is one of the lightest python micro-frameworks for making websites. To handle a form submission, first import the request class from bottle.
from bottle import request
Add allowed request method on the desired route and access the form data. An example is below.
title = request.forms.get('title')
body = request.forms.get('body')
#handle form data as desired here
That is all. Check out other bottle tutorials if you are interested.