Parent and child classes in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a child class that inherits from the parent class.

Python

class Parent:
    def greet(self):
        return "Hello from Parent"

class Child([1]):
    pass

Drag options to blanks, or click blank then click option'

Aobject

BParent

CChild

Dself

Attempts:

3 left

💡 Hint

Common Mistakes

Using the child class name instead of the parent class name in inheritance.

Forgetting to put parentheses after the child class name.

The child class must inherit from the parent class by naming it in parentheses.

2fill in blank

medium

Complete the code to call the parent class method from the child class.

Python

class Parent:
    def greet(self):
        return "Hello from Parent"

class Child(Parent):
    def greet(self):
        return "Child says: " + [1].greet()

Drag options to blanks, or click blank then click option'

Asuper()

Bself

CParent

DChild

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the method on self which causes recursion.

Calling the method on the child class name instead of the parent.

Use super() to call the parent class method inside the child class.

3fill in blank

hard

Fix the error in the child class constructor to properly call the parent constructor.

Python

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

class Child(Parent):
    def __init__(self, name, age):
        [1].__init__(self, name)
        self.age = age

Drag options to blanks, or click blank then click option'

Asuper()

BChild

Cself

DParent

Attempts:

3 left

💡 Hint

Common Mistakes

Using self.__init__ which causes infinite recursion.

Using super() without parentheses or incorrectly.

Use the parent class name to call its constructor with Parent.__init__(self, name).

4fill in blank

hard

Fill in the blank to create a child class that overrides a method and calls the parent method inside it.

Python

class Parent:
    def info(self):
        return "Parent info"

class Child(Parent):
    def info(self):
        return [1]().info() + " and Child info"

Drag options to blanks, or click blank then click option'

AParent

Bself

Csuper

DChild

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the method on self which causes recursion.

Calling the method on the child class name instead of the parent.

Use super() to call the parent class method inside the overridden method.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps child class names to their ages if age is greater than 10.

Python

children = [Child("Anna", 12), Child("Ben", 9), Child("Cara", 15)]
ages = { [1]: [2] for child in children if child.age [3] 10 }

Drag options to blanks, or click blank then click option'

Achild.name

Bchild.age

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong attribute for keys or values.

Using the wrong comparison operator causing wrong filtering.

The dictionary comprehension uses child.name as key, child.age as value, and filters ages greater than 10.