Python Objects and Classes

1) Define an Empty Class

Create an empty class Person. Then create an object of this class and print it.

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2) Class With Constructor

Define a class Person with a constructor that takes name. Create an object and print the name.

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3) Class With Two Attributes

Make a class Car with attributes make and year. Instantiate and print both attributes.

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4) Method in Class

Define class Dog with method bark() that prints:

Woof!

Create an object and call the method.

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5) Add a Method With Args

Define greet(self, name) in class Greeter that prints:

Hello, <name>!

Call it.

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6) Class With Default Attribute

Create class Book with default attribute:

pages = 100

Print it from an object.

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7) Modify Attribute

Create a class Student with attribute grade. Change grade on an object and print before/after.

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8) Multiple Objects

Define class Point with x and y. Create three objects and print their coordinates.

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9) Calculate Inside Method

Create class Rectangle with method area() that returns length * breadth.

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10) Object List

Create 3 Person objects and store them in a list. Loop and print each name.

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11) Method That Returns Value

Add get_age() to class Person that returns age. Create object and print return value.

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12) Use __str__

Override __str__ in a class Car to return:

<make> – <year>

Print the object directly.

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13) Increment Attribute in Method

Create class Counter with count = 0 and method increment() that increases it by 1.

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14) Class With List Attribute

Define class Team with list members. Add a method to append a member and print the list.

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15) Class With Multiple Methods

Class Calculator with methods: add(), sub(), mul(), div().

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16) Constructor With Multiple Args

Make class Laptop with constructor taking brand, ram, price. Print all attributes.

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17) Compare Two Objects

Create two Point objects and write a method to check if they are equal.

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18) Class With Default Parameters

Define a class Person where age defaults to 18 if not provided.

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19) Object Interaction

Create class Author and class Book. Each Book has an Author object inside. Print both.

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20) Count Instances

Add a class variable in any class to count how many objects have been created.

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📝 Concepts Practiced

Topic	Brief
Class definition	class Name:
Constructor	__init__()
Instance attributes	self.x
Methods	Functions inside classes
Object creation	obj = ClassName()
Special methods	__str__
Class vs instance variables	Shared vs per object

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📌 Starter Template

Basic class with constructor and attribute:

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

p = Person("Alice")
print(p.name)

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canvil: 333f6c7d-6876-4f7e-b6ad-1bdb2233f5c1