Python Classes: What They Are And Why They're Great!
Published: 2023-08-10 05:44:41

Before I enrolled in the software engineering bootcamp I'm currently attending, I took an Intro to Python course on Codecademy.com. I wanted to get a feel for what coding was actually like before committing to a bootcamp and a few of my friends recommended Python as a good jumping off point. They were right, Python was fantastic language to begin with! However, towards the end of the intro coarse the idea of classes was introduced and I struggled to wrap my head around. It was hard for me to conceptualize at first what they could be used for but after gaining more experience and seeing them in action and I started to understand their power.   

## So, What Are Classes in Python?

Classes are a fundamental concept in object-oriented programming (OOP) and play a crucial role in creating organized, reusable, and maintainable code. They are blueprints for creating objects. Classes allow you to define a new data type, encapsulating both data (attributes) and functions (methods) that operate on the data. This concept is known as encapsulation, which helps to organize and manage code more effectively.

Picture this: You're in a virtual pet shop, and each pet has its own set of features and characteristics. All the pets have a name, age, and species they belong to, but these will be different depending on the pet. We can set up a class and now we'll be able to easily access information about each of them! Let's set up a simple class for our virtual pets:

```
class VirtualPet:
    def __init__(self, name, age, species):
        self.name = name  # Attribute
        self.age = age  # Attribute
        self.species = species  # Attribute

```

Attributes are variables that store data related to the class. They represent the characteristics of an object. We'll be able to access the name, age, and species of each pet by using these attributes. Now that we have our class set up, let's create some instances of Pet to represent some of our virtual pets:

```
roboDog1 = VirtualPet('Fido', 10, 'dog')
eKitty1 = VirtualPet('Potato, 7, 'cat')

```
Now if we want to see the name of our first roboDog or the age of our first eKitty we can use our attribute!

```
print(roboDog1.name)
# Output: Fido

print(eKitty1.age)
# Output: 7

```
Attributes are great for accessing data about an object, but what if we wanted some more functionality from our class. That's where methods come in. Methods are functions defined within a class that can perform actions or computations related to the class. They define the behavior of the objects created from the class. Continuing with our VirtualPet example, methods could include feed() and sleep(). Let's add these methods to our VirtualPet class.

```
class VirtualPet:
    def __init__(self, name, age, species):
        self.name = name        # Attribute
        self.age = age          # Attribute
        self.species = species  # Attribute

    def sleep(self):            # Method
        return f"{self.name} the {self.species} is taking a nap."

    def eat(self, food):       # Method
        return f"{self.name} is eating {food}, yum!"

```
Now we can have our pets carry out these activities! 

```
print(eKitty1.sleep())
# Output: Potato the cat is taking a nap.

print(roboDog1.feed('CyberChow'))
# Output: Fido is eating CyberChow, yum!

```

## Benefits of Python Classes

Now, let's delve into why Python classes are so useful:

**Modularity and Reusability**: Classes allow you to break down complex systems into smaller, manageable modules. These modules can be reused across different projects, saving development time and effort.

**Organized Code**: By encapsulating data and methods within classes, you can organize your code more logically. This makes it easier to understand, maintain, and debug your codebase.

**Code Extensibility**: Inheritance and polymorphism enable you to create new classes that inherit and extend the behavior of existing classes. This promotes code extensibility without modifying the original class.

**Collaboration**: Classes enable multiple developers to work on different components of a project simultaneously, as long as they adhere to the defined class interfaces.

**Improved Testing**: Classes allow you to write unit tests for individual components, making it easier to identify and fix issues during the development process.

Python classes are a powerful tool in object-oriented programming that facilitate the creation of well-organized, modular, and reusable code. They enable you to encapsulate data and behavior, promote code extensibility, and improve collaboration among developers. Incorporating classes into your programming arsenal can lead to more efficient and maintainable software development!