how to solve this in python 3.6 and no importing allowed

create the infrastructure for a calendar apicton that can store events and check if two events Our goal is to create the infrastructure for a calendar application that can store events and check if two events would overlap (clash). In order to do this, we will create classes that represent a moment in time, a span of time, an event (like "lunch with mom"), and an event planner. You will also create some exception classes, and you'll handle them and other kinds of built-in exceptions as part of the various methods and functions that you'll be writing. We won't actually be creating the full application, as that would be too large a project but you could imagine storing the event planner to a text file and creating a small menu to load the event planner, show it to the user, and give them options for adding/removing events