Python Inheritance

1. What is Inheritance?

Inheritance means one class gets features from another class.

In simple words:
👉 A new class uses code of an existing class
👉 It saves time
👉 It avoids writing the same code again

2. Real-Life Example

Think about parents and children 👨‍👩‍👦

• Child gets features from parents

• Same idea works in Python

3. Parent Class and Child Class

• Parent class → gives features

• Child class → takes features

4. Simple Inheritance Example

Example

Output:

5. Why Use Inheritance?

✔ Reuse code
✔ Easy to manage
✔ Makes program clean
✔ Used in real projects

6. Inheritance with Constructor (__init__)

Example

7. Using super() in Inheritance

super() is used to call parent class constructor.

Example

8. Method Overriding

Child class can change parent method.

Example

9. Types of Inheritance (Basic)

Single Inheritance

One parent → one child

Multilevel Inheritance

Parent → child → grandchild

Multiple Inheritance

One child → many parents

10. Common Beginner Mistakes

❌ Forgetting Parent Class Name

❌ No inheritance.

✔ Correct:

❌ Not Using super() Properly

👉 Parent constructor not called.

11. Simple Practice Examples

Example 1: Vehicle

Example 2: Employee

Example 3: Shape

12. Summary (Python Inheritance)

✔ Inheritance reuses code
✔ Child class uses parent class
✔ super() calls parent constructor
✔ Method overriding is allowed
✔ Important OOP concept

📘 Perfect for Beginner eBook

This chapter is ideal for:

• Python beginner books

• School & college students

• Self-learners

If you want next, I can write:

• Encapsulation

• Polymorphism

• Abstract Classes

• Mini OOP Projects

Just tell me 😊