Step 1: Making Instances

OK, so much for the design phase—let’s move on to implementation. Our first task is to start coding the main class, Person. In your favorite text editor, open a new file for the code we’ll be writing. It’s a fairly strong convention in Python to begin module names with a lowercase letter and class names with an uppercase letter; like the name of self arguments in methods, this is not required by the language, but it’s so common that deviating might be confusing to people who later read your code. To conform, we’ll call our new module file person.py and our class within it Person, like this:

# File person.py (start)

class Person:

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All our work will be done in this file until later in this chapter. We can code any number of functions and classes in a single module file in Python, and this one’s person.py name might not make much sense if we add unrelated components to it later. For now, we’ll assume everything in it will be Person-related. It probably should be anyhow—as we’ve learned, modules tend to work best when they have a single, cohesive purpose.