Code Notes – Free Programming Reference by Vaibhav Rathod

Class

2 min read

Explanation

- A class is a blueprint for creating objects (instances). It defines the properties (attributes) and behaviors (methods) that the objects created from it will have. In Python, a class is created using the `class` keyword.

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Steps

  • Use the class keyword to define a class.
  • Add a Constructor (__init__):
    • The constructor method is used to initialize the attributes of the class when an object is created.
  • Define Methods:
    • Methods are functions defined inside a class to perform actions or computations. These methods can modify or interact with the object’s attributes.
  • Create Objects:
    • Once a class is defined, you can create objects (instances) of that class.
# Step 1: Define the class
class Dog:
    # Step 2: Add a constructor to initialize attributes
    def __init__(self, name, age):
        self.name = name  # attribute 'name'
        self.age = age    # attribute 'age'
 
    # Step 3: Define a method
    def bark(self):
        print(f"{self.name} says woof!")
 
    # Another method
    def info(self):
        print(f"{self.name} is {self.age} years old.")
 
# Step 4: Create objects (instances) of the class
dog1 = Dog("Buddy", 3)
dog2 = Dog("Lucy", 5)
 
# Call methods on objects
dog1.bark()   # Output: Buddy says woof!
dog1.info()   # Output: Buddy is 3 years old.
 
dog2.bark()   # Output: Lucy says woof!
dog2.info()   # Output: Lucy is 5 years old.

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