Procedural vs object-oriented approach in Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a function that adds two numbers.

Python

def add_numbers(a, b):
    return a [1] b

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

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' instead of '+' will subtract instead of add.

Using '*' or '/' will multiply or divide, which is not correct here.

The plus sign + adds two numbers together in Python.

2fill in blank

medium

Complete the code to create a class named Calculator.

Python

class [1]:
    def __init__(self):
        pass

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

ANumber

BFunction

CAdd

DCalculator

Attempts:

3 left

💡 Hint

Common Mistakes

Using a lowercase or unrelated name for the class.

Using 'Function' which is not a class name here.

The class name should be Calculator to represent the object-oriented approach.

3fill in blank

hard

Fix the error in the method definition inside the class.

Python

class Calculator:
    def [1](self, a, b):
        return a + b

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

A__init__

Bself

Cadd

Dcalculate

Attempts:

3 left

💡 Hint

Common Mistakes

Using '__init__' which is the constructor, not the add method.

Using 'self' as a method name, which is a parameter name.

The method name should be add to describe the action of adding numbers.

4fill in blank

hard

Fill both blanks to create an object and call its add method.

Python

calc = [1]()
result = calc.[2](5, 3)

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

ACalculator

Badd

Ccalculate

DFunction

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong class name or method name.

Calling a method that does not exist.

We create an object of class Calculator and call its add method.

5fill in blank

hard

Fill all three blanks to convert a procedural add function into an object-oriented method call.

Python

def [1](a, b):
    return a + b

class Calculator:
    def [2](self, a, b):
        return a + b

result1 = [3](4, 6)
calc = Calculator()
result2 = calc.add(4, 6)

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

Aadd

Cadd_numbers

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for both procedural function and method.

Calling a function that is not defined.

The procedural function is named add_numbers, the method inside the class is add, and the procedural function is called as add_numbers(4, 6).