15. Create Class, Object and Method with Examples in Python (Video in Khmer)

Hello friend! 👋 A class is like a plan. An object is made from that plan. Objects can have data and actions.

In this post, I show you how to make a class, create objects, and use methods. Easy and short. 🐍

🧱 Create a Class and Object

Use class to make a class. Create an object by calling the class name with ().

class Person:
    pass

person1 = Person()
print(person1)   # A Person object

pass mean the class is empty for now.

🎥 Video: Introduction to Class and Object in Python (Khmer)

📦 Add Data with `init`

__init__ run when you create an object. Use self to save data in that object.

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

person1 = Person("Dara", 20)
print(person1.name)   # Dara
print(person1.age)    # 20

name and age are attributes. Each object can have its own values.

🎥 Video: Create Person Class and Access Attributes (Khmer)

⚙️ Add a Method

A method is a function inside a class. It can use the object's data with self.

class Car:
    def __init__(self, brand):
        self.brand = brand

    def drive(self):
        print(self.brand, "is driving")

my_car = Car("Toyota")
my_car.drive()   # Toyota is driving

Call a method with the object name, a dot, and the method name.

🎥 Video: Create Car Class and Access a Method (Khmer)

🚗 Make Many Objects

You can put objects in a list and use a loop to show them.

class Car:
    def __init__(self, brand):
        self.brand = brand

cars = [Car("Toyota"), Car("Honda"), Car("Ford")]

for car in cars:
    print(car.brand)

Output:

Toyota
Honda
Ford

🎥 Video: Create a List of Car Objects and Print Them (Khmer)

❌ Common Errors

Forget `self`

Methods need self as the first parameter:

class Person:
    def say_hello(self):
        print("Hello!")

Call the method with parentheses

class Person:
    def say_hello(self):
        print("Hello!")

person1 = Person()
person1.say_hello()

💡 Tips

A class is a plan. An object is made from the class.
Use a capital letter at the start of a class name, like Person.
Use __init__ to set up new objects.
Use self to access data and methods for the current object.
An attribute stores data. A method does an action.
Use a list when you need to keep many objects together.
Indent code inside the class and its methods.

❓ Any Question?

Tell us in comment below! 👇

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