Case study

Let's try to tie everything we've learned together with a larger example. We'll be designing a simple real estate application that allows an agent to manage properties available for purchase or rent. There will be two types of properties: apartments and houses. The agent needs to be able to enter a few relevant details about new properties, list all currently available properties, and mark a property as sold or rented. For brevity, we won't worry about editing property details or reactivating a property after it is sold.

The project will allow the agent to interact with the objects using the Python interpreter prompt. In this world of graphical user interfaces and web applications, you might be wondering why we're creating such old-fashioned looking programs. Simply put, both windowed programs and web applications require a lot of overhead knowledge and boilerplate code to make them do what is required. If we were developing software using either of these paradigms, we'd get so...