Lesson 8
Making Objects the Main Star!
Chapter 3: Classes and attributes
Class definition and instantiation
Now, let’s delve deeper into designing classes, step by step! Please follow along and try it yourself!
Let’s stick with defining a Person
class. I have given you the minimum form of a class definition. Quite straightforward!
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Our favourite PEP 8 states that “class names should normally use the CapWords convention”. So name your objects in CamelCase, like YorkshireTerrier
or ComputerMonitor
.
I am enforcing this strictly for this course. So please use CamelCase
for your ClassName
. This helps you distinguish between variables and function names (which should both be in lowercase) much better. It is also the convention in most programming languages anyway!
You can now create a new instance of your brand new Person
class (although it is not quite useful at the moment!)
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The code should output something like <__main__.Person object at 0x7fe70c878c10>
for Line 5. So manager
points to the object
of class Person
at memory location 0x7fe70c878c10
. We will talk about __main__
in the next chapter - it will make more sense then!
The built-in isinstance()
function (Line 6) will return True
if your object is an instance of a given class.
In essence, you have created a new instance of class Person
!