What is it

Python is Object Oriented language Class is an object constructor or a "blueprint" for creating objects

Syntax

Creation

Creating a Class; created class named MyClass with property x

class MyClass: 
	x = 5

Instantiation

Creating an object; created an object name class_one using MyClass and printed the property of x

class_one = MyClass()

print(class_one.x) # 5

Init Constructor

__init__

All functions have class called __init__() which is always executed when class is initiated

Use the __init__() function to assign values to object properties. It also requires self to be passed as a first parameter

class Person: 
	def __init__(self, name, age): 
		self.name = name 
		self.age = age 

p1 = Person("John", 36) 

print(p1.name) # "John" 
print(p1.age) # 36

Methods in objects are functions that belong to the object

class Person: 
	def __init__(self, name, age): 
		self.name = name 
		self.age = age

	def myfunc(self): 
		print("Hello my name is " + self.name) 

p1 = Person("John", 36) 
p1.myfunc()

Self keyword

The self parameter is a reference to the current instance of the class, and is used to access variables that belong to the class

It does not have to be named self , you can call it whatever you like, but it has to be the first parameter of any function in the class

class Person: 
	def __init__(mysillyobject, name, age): 
		mysillyobject.name = name 
		mysillyobject.age = age 

	def myfunc(abc): 
		print("Hello my name is " + abc.name) 

p1 = Person("John", 36) 
p1.myfunc()

Modifying the instantiated object

Modify Object Properties through literal assignment

p1.age = 40

Deleting object or properties

del p1.age # deletes age property 
del p1 # deletes the p1 object