Tutorial #5: Python Object Oriented Programming Cheat Sheet

Python Object Oriented Programming Cheat Sheet

Python Object Oriented Programming Cheat Sheet Remarkable Secrets!

Complete Python Bootcamp From Zero to Hero in Python – Object Oriented Programming (OOP)

1.1 Objects

1.2 Class

1.3 Attributes

1.4 Methods

1.5 Inheritance

1.6 Polymorphism

1.7 Special Methods

1.1 Objects

print(type(1))

print(type(‘A’))

print(type([]))

print(type(()))

print(type({}))

# output:

<class ‘int’>

<class ‘str’>

<class ‘list’>

<class ‘tuple’>

<class ‘dict’>

—————————————————————–

1.2 Class – Python Object Oriented Programming Cheat Sheet Professional!

# Create a new object type called Sample

class Sample:

pass

# Instance of Sample

x = Sample()

print(type(x))

# output:

<class ‘__main__.Sample’>

—————————————————————–

1.3 Attributes

class Dog:

def __init__(self, breed):

self.breed = breed

kembot = Dog(breed=’Lab’)

kimchi = Dog(breed=’Huskie’)

hb = Dog(breed=’Frenchie’)

titan = Dog(breed=’Local’)

lucky = Dog(breed=’Askal’)

print(kembot.breed)

print(kimchi.breed)

print(hb.breed)

print(titan.breed)

print(lucky.breed)

# output:

Lab

Huskie

Frenchie

Local

Askal

—————————————————————–

class Dog:

# Class Object Attribute

species = ‘Mammal’

def __init__(self, breed, name):

self.breed = breed

self.name = name

dog_info = Dog(‘Lab’, ‘Kembot’)

print(dog_info.species)

print(dog_info.breed)

print(dog_info.name)

# output:

Mammal

Lab

Kembot

—————————————————————–

class Dog:

# Class Object Attribute

species = ‘Mammal’

def __init__(self, breed, name):

self.breed = breed

self.name = name

def bark(self, number):

print(“WOOF! My name is {}, my breed is {}, my number is {}”.format(self.name, self.breed, number))

dog_info = Dog(‘Lab’, ‘Kembot’)

print(dog_info.bark(11111111))

# output:

WOOF! My name is Kembot, my breed is Lab, my number is 11111111

—————————————————————–

1.4 Methods

class Circle:

pi = 3.14

# Circle gets instantiated with a radius (default is 1)

def __init__(self, radius=1):

self.radius = radius

self.area = radius * radius * Circle.pi

# Method for resetting Radius

def setRadius(self, new_radius):

self.radius = new_radius

self.area = new_radius * new_radius * self.pi

# Method for getting Circumference

def getCircumference(self):

return self.radius * self.pi * 2

c = Circle()

print(‘Radius is: ‘, c.radius)

print(‘Area is: ‘, c.area)

print(‘Circumference is: ‘, c.getCircumference())

# output:

Radius is: 1

Area is: 3.14

Circumference is: 6.28

—————————————————————–

c = Circle()

c.setRadius(2)

print(‘Radius is: ‘, c.radius)

print(‘Area is: ‘, c.area)

print(‘Circumference is: ‘, c.getCircumference())

# output:

Radius is: 2

Area is: 12.56

Circumference is: 12.56

—————————————————————–

1.5 Inheritance

class Animal:

def __init__(self):

print(“Animal created”)

def whoAmI(self):

print(“Animal”)

def eat(self):

print(“Eating”)

class Dog(Animal):

def __init__(self):

Animal.__init__(self)

print(“Dog created”)

def whoAmI(self):

print(“Dog”)

def bark(self):

print(“Woof!”)

d = Dog()

# output:

Animal created

Dog created

—————————————————————–

d.whoAmI()

d.eat()

d.bark()

# output:

Dog

Eating

Woof!

—————————————————————–

1.6 Polymorphism

class Dog:

def __init__(self, name):

self.name = name

def speak(self):

return self.name + ‘ says Woof!’

class Cat:

def __init__(self, name):

self.name = name

def speak(self):

return self.name + ‘ says Meow!’

barney = Dog(‘Barney’)

tom = Cat(‘Tom’)

print(barney.speak())

print(tom.speak())

# output:

# Barney says Woof!

# Tom says Meow!

—————————————————————–

for pet in [barney, tom]:

print(pet.speak())

# output:

# Barney says Woof!

# Tom says Meow!

—————————————————————–

def pet_speak(pet):

print(pet.speak())

pet_speak(barney)

pet_speak(tom)

# output:

# Barney says Woof!

# Tom says Meow!

—————————————————————–

class Animal:

def __init__(self, name): # Constructor of the class

self.name = name

def speak(self): # Abstract method, defined by convention only

raise NotImplementedError(“Subclass must implement abstract method”)

class Dog(Animal):

def speak(self):

return self.name + ‘ says Woof!’

class Cat(Animal):

def speak(self):

return self.name + ‘ says Meow!’

barney = Dog(‘Barney’)

tom = Cat(‘Tom’)

print(barney.speak())

print(tom.speak())

# output:

Barney says Woof!

Tom says Meow!

—————————————————————–

1.7 Special Methods – Python Object Oriented Programming Cheat Sheet Best Selling!

The __init__(), __str__(), __len__() and __del__() special methods

class Book:

def __init__(self, title, author, pages):

print(“A book is created”)

self.title = title

self.author = author

self.pages = pages

def __str__(self):

return “Title: %s, author: %s, pages: %s” % (self.title, self.author, self.pages)

def __len__(self):

return self.pages

def __del__(self):

print(“A book is deleted”)

book = Book(“Python – Smarter not Harder”, “Al Ardosa”, 100)

# Special Methods

print(book)

print(len(book))

del book

# output:

A book is created

Title: Python – Smarter not Harder, author: Al Ardosa, pages: 100

100

A book is deleted

Python Object Oriented Programming Cheat Sheet
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