Default values in constructors in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a default value for the 'color' attribute in the constructor.

Python

class Car:
    def __init__(self, color=[1]):
        self.color = color

my_car = Car()
print(my_car.color)

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

ANone

B"red"

Cred

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around string default values.

Using a variable name without quotes as a default value.

The default value for the 'color' parameter should be a string, so it must be enclosed in quotes.

2fill in blank

medium

Complete the constructor to give 'speed' a default value of 0.

Python

class Bike:
    def __init__(self, speed=[1]):
        self.speed = speed

my_bike = Bike()
print(my_bike.speed)

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

A0

B"0"

CNone

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string '0' instead of the number 0.

Leaving the default value empty.

The default value for 'speed' should be the number 0, not a string.

3fill in blank

hard

Fix the error in the constructor by completing the default value for 'name'.

Python

class Person:
    def __init__(self, name=[1]):
        self.name = name

p = Person()
print(p.name)

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

ANone

B''

C0

D"Unknown"

Attempts:

3 left

💡 Hint

Common Mistakes

Using None without handling it in the code.

Using a number 0 as a name.

The default name should be a string, so "Unknown" is the best choice.

4fill in blank

hard

Fill both blanks to set default values for 'width' and 'height' in the constructor.

Python

class Rectangle:
    def __init__(self, width=[1], height=[2]):
        self.width = width
        self.height = height

rect = Rectangle()
print(rect.width, rect.height)

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

A1

B0

C"0"

D"1"

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of numbers for default sizes.

Setting default sizes to 0 which might represent no size.

Both width and height should default to the number 1 for a simple rectangle size.

5fill in blank

hard

Fill all three blanks to set default values for 'title', 'author', and 'pages' in the constructor.

Python

class Book:
    def __init__(self, title=[1], author=[2], pages=[3]):
        self.title = title
        self.author = author
        self.pages = pages

book = Book()
print(book.title, book.author, book.pages)

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

A"Untitled"

B"Anonymous"

C0

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using None for strings without handling it.

Putting numbers in quotes.

The title and author are strings with default names, and pages is a number defaulting to 0.