Class definition syntax in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the basic syntax to define a class in Python?

Use the <code>class</code> keyword followed by the class name and a colon. Inside, indent the class body.<br><br>Example:<br><code>class MyClass:<br>    pass</code>

beginner

What is the purpose of the __init__ method in a class?

It is a special method called a constructor. It runs automatically when you create an object from the class. It is used to set up initial values.

beginner

How do you create an object from a class named <code>Car</code>?

Call the class name like a function:<br><code>my_car = Car()</code><br>This creates a new object called <code>my_car</code>.

intermediate

What is the role of the <code>self</code> parameter in class methods?

self represents the instance of the class. It lets methods access or change the object's own data.

beginner

Can a Python class have multiple methods? How are they defined?

Yes. Define each method inside the class with <code>def</code> and indent them. Each method should have <code>self</code> as the first parameter.<br><br>Example:<br><code>class Dog:<br>    def bark(self):<br>        print('Woof!')</code>

Which keyword is used to define a class in Python?

A func

B def

C object

D class

The class keyword is used to define a class.

What does the __init__ method do?

A Deletes an object

B Prints the class name

C Initializes a new object when the class is called

D Runs only when the program ends

The __init__ method runs automatically to set up a new object.

What is the first parameter of a method inside a class usually called?

A self

B this

C obj

D instance

By convention, the first parameter is named self to refer to the object.

How do you create an instance of a class named Person?

A person = class Person

B person = Person()

C person = new Person

D person = Person[]

You call the class like a function to create an object: Person().

Which of these is a correct method definition inside a class?

A def greet(self):

B function greet():

C def greet():

D method greet(self):

Methods inside classes use def and include self as the first parameter.

Explain how to define a simple class in Python and create an object from it.

Think about the basic structure and how you make an object.

Describe the role of the __init__ method and the self parameter in a class.

Focus on how objects start and how methods know which object they belong to.