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Step 7 (Final): Storing Objects in a Database
At this point, our work is almost complete. We now have a two-module system that not only implements our original design goals for representing people, but also provides a general attribute display tool we can use in other programs in the future. By coding functions and classes in module files, we’ve ensured that they naturally support reuse. And by coding our software as classes, we’ve ensured that it naturally supports extension.
Although our classes work as planned, though, the objects they create are not real database records. That is, if we kill Python, our instances will disappear—they’re transient objects in memory and are not stored in a more permanent medium like a file, so they won’t be available in future program runs. It turns out that it’s easy to make instance objects more permanent, with a Python feature called object persistence—making objects live on after the program that creates them exits. As a final step in this tutorial, let’s make our objects permanent.
