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Practice

How to Declare a Class in Python

In Python, a class is declared using the class keyword.

A class name is typically written in Pascal Case, where each word starts with a capital letter.

In Pascal Case, multiple words are combined without spaces, and each word starts with a capital letter.

For example, total amount becomes TotalAmount, with spaces removed and the first letter of each word capitalized.


Basic Structure of a Class Declaration​

The basic structure for declaring a class is as follows.

Basic Structure of Class Declaration
class ClassName:
    # Definition of attributes and methods
    ...

After the class keyword, the class name is followed by a colon (:), and the body of the class includes its attributes and methods.

You can create an object from the class by placing parentheses () after the class name.

Creating a Class Object
test = ClassName()

The above code demonstrates how to create an object named test using the ClassName class.

If the class has a constructor method (__init__) that accepts parameters, you need to pass arguments when creating an object.

Creating a Class Object with a Constructor Method
class ClassName:
    def __init__(self, arg1, arg2):
        # Contents of the constructor method
        ...

test = ClassName(arg1, arg2)

As shown above, you must pass arg1, arg2 that match the type and number of arguments defined in the constructor method __init__.

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