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Python

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Python Inheritance

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Inheritance allows you to define a class that inherits all the methods and properties from another class.

🔹 Parent Class

The class being inherited from is called the parent class (or base class).

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

    def speak(self):
        print("Animal speaks")

🔹 Child Class

The class that inherits from another is called the child class (or derived class).

class Dog(Animal):
    def bark(self):
        print("Woof!")

d = Dog("Tommy")
print(d.name)   # Tommy
d.speak()       # Animal speaks
d.bark()        # Woof!

✅ The child class gets access to all methods and properties of the parent class.

🔹 The super() Function

Use super() to call the parent class’s constructor or methods.

class Cat(Animal):
    def __init__(self, name, color):
        super().__init__(name)
        self.color = color

🔹 Override Methods

A child class can override methods from the parent class.

class Bird(Animal):
    def speak(self):
        print("Tweet")

✅ If the child class defines a method with the same name, it will override the parent version.

🔹 Multiple Inheritance

A class can inherit from more than one class.

class A:
    def showA(self):
        print("Class A")

class B:
    def showB(self):
        print("Class B")

class C(A, B):
    pass

obj = C()
obj.showA()
obj.showB()

Practice Questions

Q1. Write a Python program to create a parent class Employee with properties name and salary.

Q2. Write a Python program to create a child class Manager that inherits from Employee.

Q3. Write a Python program to add a method in the Employee class to display employee details.

Q4. Write a Python program to add an extra method in the Manager class to display department or role-specific info.

Q5. Write a Python program to use super() in the Manager class constructor to call the parent constructor.

Q6. Write a Python program to override a method from the Employee class inside the Manager class.

Q7. Write a Python program to create a parent class Shape and a child class Circle that inherits from it.

Q8. Write a Python program to add __init__() to both Shape and Circle and use inheritance to pass values.

Q9. Write a Python program to demonstrate multiple inheritance using two classes Father and Mother.

Q10. Write a Python program to call both parent methods from a child class object, using method resolution order (MRO).

Python Inheritance Quiz

Q1: What is inheritance in Python?

A. Copying a function
B. Reusing code from another class
C. Converting data types
D. Importing a module

Q2: What is the class being inherited called?

A. Subclass
B. Master class
C. Parent class
D. Extension class

Q3: What is the class that inherits called?

A. Top class
B. Base class
C. Main class
D. Child class

Q4: What is the purpose of super()?

A. To exit the program
B. To create a new class
C. To access parent methods and constructor
D. To delete an object

Q5: What happens if a method is overridden in child class?

A. Both methods run
B. Only parent method runs
C. Child method replaces parent method
D. Program stops

Q6: Can Python support multiple inheritance?

A. Yes
B. No
C. Only with one class
D. Only in Python 3

Q7: What is required for inheritance to work?

A. Import keyword
B. Use of self
C. Passing parent class in parentheses
D. Creating global variables

Q8: Which statement is true about super()?

A. It runs all child methods
B. It calls parent constructor
C. It adds attributes to objects
D. It deletes the base class

Q9: Can we inherit properties and methods from another class?

A. Only variables
B. Only functions
C. Yes, both
D. No

Q10: What is method overriding?

A. Deleting a method
B. Creating duplicate methods
C. Redefining parent method in child class
D. Using multiple methods together
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