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‎refactor/chp21/dog_class.py

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class Dog():
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# Class Attribute
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species = 'mammal'
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# Initializer / Instance Attributes
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def __init__(self, name, age):
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self.name = name
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self.age = age
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# Instantiate the Dog object
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philo = Dog("Philo", 5)
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mikey = Dog("Mikey", 6)
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# Access the instance attributes
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print("{} is {} and {} is {}.".format(
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philo.name, philo.age, mikey.name, mikey.age))
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# Is Philo a mammal?
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if philo.species == "mammal":
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print("{0} is a {1}!".format(philo.name, philo.species))

‎refactor/chp21/dog_inheritence.py

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# Parent class
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class Dog():
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# Class attribute
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species = 'mammal'
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# Initializer / Instance attributes
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def __init__(self, name, age):
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self.name = name
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self.age = age
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# instance method
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def description(self):
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return self.name, self.age
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# instance method
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def speak(self, sound):
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return "%s says %s" % (self.name, sound)
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# child class (inherits from Dog() class)
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class RussellTerrier(Dog):
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def run(self, speed):
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return "%s runs %s" % (self.name, speed)
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# child class (inherits from Dog() class)
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class Bulldog(Dog):
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def run(self, speed):
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return "%s runs %s" % (self.name, speed)
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# child classes inherit attributes and
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# behaviors from the parent class
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jim = Bulldog("Jim", 12)
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print(jim.description())
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# child classes have specific attributes
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# and behaviors as well
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print(jim.run("slow"))

‎refactor/chp21/dog_instance_methods.py

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< F438 tbody>
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class Dog():
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# Class Attribute
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species = 'mammal'
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# Initializer / Instance Attributes
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def __init__(self, name, age):
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self.name = name
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self.age = age
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# instance method
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def description(self):
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return self.name, self.age
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# instance method
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def speak(self, sound):
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return "%s says %s" % (self.name, sound)
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# Instantiate the Dog object
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mikey = Dog("Mikey", 6)
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# call our instance methods
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print(mikey.description())
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print(mikey.speak("Gruff Gruff"))

‎refactor/chp21/dog_isinstance.py

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# Parent class
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class Dog():
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# Class attribute
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species = 'mammal'
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# Initializer / Instance attributes
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def __init__(self, name, age):
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self.name = name
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self.age = age
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# instance method
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def description(self):
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return self.name, self.age
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# instance method
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def speak(self, sound):
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return "%s says %s" % (self.name, sound)
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# child class (inherits from Dog() class)
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class RussellTerrier(Dog):
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def run(self, speed):
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return "%s runs %s" % (self.name, speed)
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# child class (inherits from Dog() class)
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class Bulldog(Dog):
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def run(self, speed):
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return "%s runs %s" % (self.name, speed)
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# child classes inherit attributes and
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# behaviors from the parent class
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jim = Bulldog("Jim", 12)
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print(jim.description())
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# child classes have specific attributes
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# and behaviors as well
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print(jim.run("slow"))
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# is jim an instance of Dog()?
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print(isinstance(jim, Dog))
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# is julie an instance of Dog()?
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julie = Dog("Julie", 100)
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print(isinstance(julie, Dog))
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# is johnny walker an instance of Bulldog()
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johnnywalker = RussellTerrier("Johnny Walker", 4)
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print(isinstance(johnnywalker, Bulldog))
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# is julie and instance of jim?
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print(isinstance(julie, jim))

‎refactor/chp21/dog_walking.py

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# parent class
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class Pet():
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dogs = []
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def __init__(self, dogs):
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self.dogs = dogs
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def walk(self):
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for dog in self.dogs:
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print(dog.walk())
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# parent class
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class Dog():
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# class attribute
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species = 'mammal'
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is_hungry = True
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# initializer / instance attributes
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def __init__(self, name, age):
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self.name = name
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self.age = age
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# instance method
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def description(self):
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return self.name, self.age
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# instance method
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def speak(self, sound):
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return "%s says %s" % (self.name, sound)
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# instance method
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def eat(self):
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self.is_hungry = False
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def walk(self):
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return "%s is walking!" % (self.name)
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# child class (inherits from Dog() class)
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class RussellTerrier(Dog):
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def run(self, speed):
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return "%s runs %s" % (self.name, speed)
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# child class (inherits from Dog() class)
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class Bulldog(Dog):
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def run(self, speed):
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return "%s runs %s" % (self.name, speed)
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# create instances of dogs
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my_dogs = [Bulldog("Tom", 6), RussellTerrier("Fletcher", 7), Dog("Larry", 9)]
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# instantiate the Pet() class
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my_pets = Pet(my_dogs)
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# output
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my_pets.walk()

‎refactor/chp21/github_with_class.py

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from urllib.request import Request, urlopen
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class Github(object):
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def __init__(self, username):
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self.username = username
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self.base_url = 'https://api.github.com/users/'
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def get_user_info(self):
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full_url = "{0}{1}".format(self.base_url, self.username)
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request = Request(full_url)
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handler = urlopen(request)
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if handler.getcode() == 200:
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return handler.read()
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def get_user_repos(self):
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full_url = "{0}{1}/repos".format(self.base_url, self.username)
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request = Request(full_url)
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handler = urlopen(request)
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if handler.getcode() == 200:
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return handler.read()
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user = Github('mjhea0')
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print(user.get_user_info())
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print(user.get_user_repos())

‎refactor/chp21/my_farm.py

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class Animal():
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# class attributes
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stuff_in_belly = 0
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position = 0
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# initializer
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def __init__(self, name, color):
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self.name = name
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self.color = color
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# instance methods
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def talk(self):
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return "Hello. I'm {}".format(self.name)
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def walk(self, walk_increment):
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self.position += walk_increment
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return self.position
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def run(self, run_increment):
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self.position += run_increment
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return self.position
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def feed(self):
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self.stuff_in_belly += 1
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if self.stuff_in_belly > 3:
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return self.poop()
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else:
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return "{} is eating.".format(self.name)
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def hungry(self):
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if self.stuff_in_belly < 2:
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return "{} is hungry".format(self.name)
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else:
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return "{} is not hungry".format(self.name)
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def poop(self):
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self.stuff_in_belly == 0
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return "Ate too much ... need to find a bathroom"
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class Dog(Animal):
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def talk(self):
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return "Bark! Bark!"
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def fetch(self):
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return "{} is fetching.".format(self.name)
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class Sheep(Animal):
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def talk(self):
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return "Baaa Baaa"
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class Pig(Animal):
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def talk(self):
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return "Oink Oink"
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# create a dog
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dog = Dog("Blitzer", "yellow")
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# output the dog's attributes
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print("Our dog's name is {}.".format(dog.name))
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print("And he's {}.".format(dog.color))
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# output some behavior
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print("Say something, {}.".format(dog.name))
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print(dog.talk())
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print("Go fetch!")
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print(dog.fetch())
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# walk the dog
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print("{} is at position {}.".format(dog.name, dog.walk(2)))
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# run the dog
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print("{} is now at position {}".format(dog.name, dog.run(4)))
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# feed the dog
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print(dog.feed())
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# is the dog hungry
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print(dog.hungry())
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# feed the dog more
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print(dog.feed())
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print(dog.feed())
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print(dog.hungry())
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print(dog.feed())
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print("\n")
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sheep = Sheep("Shaun", "white")
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print(sheep.talk())
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print(sheep.run(2))
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print(sheep.run(2))
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print("\n")
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pig = Pig("Carl", "pink")
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print(pig.talk())

‎refactor/chp21/oldest_dog.py

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class Dog():
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# Class Attribute
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species = 'mammal'
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# Initializer / Instance Attributes
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def __init__(self, name, age):
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self.name = name
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self.age = age
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# Instantiate the Dog object
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jake = Dog("Jake", 7)
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doug = Dog("Doug", 4)
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william = Dog("William", 5)
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# Determine the oldest dog
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def get_biggest_number(*args):
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return max(args)
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# output
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print("The oldest dog is {} years old.".format(
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get_biggest_number(jake.age, doug.age, william.age)))

‎refactor/chp21/oop_comp_check.md

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## Questions
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1. What's a class?
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2. What's an instance?
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3. What's the relationship between a class and an instance?
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4. What's the Python syntax used for defining a new class?
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5. What's the spelling convention for a class name?
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6. How do you instantiate, or create an instance of, a class?
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7. How do you access the attributes and behaviors of a class instance?
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8. What's a method?
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9. What's the purpose of `self`?
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10. What's the purpose of the `__init__` method?
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11. Describe how inheritance helps prevent code duplication.
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12. Can child classes override properties of their parents?
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## Answers
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1. A class is a mechanism used to create new user-defined data structures. It contains data as well as the methods used to process that data.
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2. An instance is a copy of the class with *actual* values, literally an object of a specific class.
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3. While a class is a blueprint used to describe how to make something, instances are objects created from those blueprints.
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4. `class PythonClassName():`
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5. CamelCase notation, starting with a capital letter - i.e., `PythonClassName()`
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6. You use the the class name, followed by parentheses. So if the class name is `Dog()`, an dog instance would be - `my_class = Dog()`.
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7. With dot notation - e.g., `instance_name.attribute_name`
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8. A function that's defined inside a class.
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9. The first argument of every method references the current instance of the class, which by convention, is named `self`. In the `__init__` method, `self` refers to the newly created object; while in other methods, `self` refers to the instance whose method was called. For more on `__init__` vs. `self`, check out [this](http://stackoverflow.com/a/625098) article.
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10. The `__init__` method initializes an instance of a class.
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11. Child classes inherit all of the parent's attributes and behaviors.
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12. Yes.
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