Exercise: Classes
In the following exercises, you'll implement the __init__ and other methods of a class. Make sure you first read through the class doctests to see what instance variables and methods are expected to exist on each class.
Plant
Finish the implementation of Plant, a class that can be used by a plant nursery to track which plants they have in inventory and how many they have of each plant.
📺 Need help with this one? Watch a video walkthrough of the solution. Then try it out yourself and apply what you learned to the exercises after.
🧩 Or, for a different form of guidance, try a Parsons Puzzle version first.
class Plant:
"""A class used by a plant nursery to track what plants they have in inventory
and how many they have of each plant.
>>> milkweed = Plant("Narrow-leaf milkweed", "Asclepias fascicularis")
>>> milkweed.common_name
'Narrow-leaf milkweed'
>>> milkweed.latin_name
'Asclepias fascicularis'
>>> milkweed.inventory
0
>>> milkweed.update_inventory(2)
>>> milkweed.inventory
2
>>> milkweed.update_inventory(3)
>>> milkweed.inventory
5
"""
def __init__(self, common_name, latin_name):
self.common_name = common_name
# Fill out the rest of this function
def update_inventory(self, amount):
# Fill out this function
MoviePurchase
Finish the implementation of MoviePurchase, a class that represents movie purchases on YouTube, tracking the title and costs of each movie bought, plus the number of times watched.
🧩 For more guidance, try a Parsons Puzzle version first.
class MoviePurchase:
"""A class that represents movie purchases on YouTube,
tracking the title and cost of each movie bought,
as well as the number of times the movie is watched.
>>> ponyo = MoviePurchase("Ponyo", 19.99)
>>> ponyo.title
'Ponyo'
>>> ponyo.cost
19.99
>>> ponyo.times_watched
0
>>> ponyo.watch()
>>> ponyo.watch()
>>> ponyo.times_watched
2
"""
def __init__(self, title, cost):
# Fill out this function
def watch(self):
# Fill out this function
Player
Finish the implementation of Player, a class that represents a player in a video game, tracking their name and health.
🧩 For more guidance, try a Parsons Puzzle version first.
class Player:
"""A class that represents a player in a video game,
tracking their name and health.
>>> player = Player("Mario")
>>> player.name
'Mario'
>>> player.health
100
>>> player.damage(10)
>>> player.health
90
>>> player.boost(5)
>>> player.health
95
"""
def __init__(self, name):
# YOUR CODE HERE
def damage(self, amount):
# YOUR CODE HERE
def boost(self, amount):
# YOUR CODE HERE
Clothing
Implement Clothing, a class that represents pieces of clothing in a closet, tracking their color, category, and clean/dirty state.
🧩 For more guidance, try a Parsons Puzzle version first.
class Clothing:
"""A class that represents pieces of clothing in a closet,
tracking the color, category, and clean/dirty state.
>>> blue_shirt = Clothing("shirt", "blue")
>>> blue_shirt.category
'shirt'
>>> blue_shirt.color
'blue'
>>> blue_shirt.is_clean
True
>>> blue_shirt.wear()
>>> blue_shirt.is_clean
False
>>> blue_shirt.clean()
>>> blue_shirt.is_clean
True
"""
# Write an __init__ method
# Write the wear() method
# Write the clean() method