Modifying object state in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to change the attribute 'color' of the car object to 'red'.

Python

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

car = Car('blue')
car.color = [1]
print(car.color)

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

A'green'

B'blue'

C'yellow'

D'red'

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the color name.

Trying to assign to the class instead of the object.

Assigning 'red' to car.color changes the car's color to red.

2fill in blank

medium

Complete the method to update the 'speed' attribute of the Bike object.

Python

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

bike = Bike(10)
bike.set_speed(20)
print(bike.speed)

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

A20

Bnew_speed

Cself.speed

Dspeed

Attempts:

3 left

💡 Hint

Common Mistakes

Using the attribute name instead of the parameter.

Assigning a fixed number instead of the parameter.

The method parameter new_speed holds the new value to assign to self.speed.

3fill in blank

hard

Fix the error in the method that increases the 'count' attribute by 1.

Python

class Counter:
    def __init__(self):
        self.count = 0
    def increment(self):
        self.count [1] 1

counter = Counter()
counter.increment()
print(counter.count)

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

A-=

B=

C+=

D*=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' which replaces the value instead of adding.

Using '-=' or '*=' which change the value incorrectly.

The += operator adds 1 to the current value of self.count.

4fill in blank

hard

Fill both blanks to create a method that doubles the 'value' attribute of the object.

Python

class Number:
    def __init__(self, value):
        self.value = value
    def double(self):
        self.value = self.value [1] [2]

num = Number(5)
num.double()
print(num.value)

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

A*

B+

C2

Dself.value

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication.

Using the wrong number or variable.

Multiplying self.value by 2 doubles its value.

5fill in blank

hard

Fill all three blanks to create a method that resets the 'score' attribute to zero and returns it.

Python

class Game:
    def __init__(self):
        self.score = 10
    def reset_score(self):
        self.score = [1]
        return [2]

player = Game()
result = player.reset_score()
print([3])

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

A0

Bself.score

Cresult

Dscore

Attempts:

3 left

💡 Hint

Common Mistakes

Returning or printing the wrong variable.

Not resetting the attribute to zero.

The method sets self.score to 0, returns it, and the returned value is stored in result which is printed.