#50 Python Tutorial for Beginners | __init__ method

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In this lecture we will learn:
– How to define variables in a class?
– What is __init__() in python?
– What is the use of the init() method?
– Creation of objects in Python
– How to set and extract values from a class?

#1
– Every object has two things: Attributes and Behaviour.
– Attributes are variables and behaviour is methods that are similar to functions.
– In python, variables will be defined in a special method known as __init__ that should be present inside the class.
– init() method must have an argument known as self with it.
def __init__(self):
– init() method in python works similarly to constructors that are present in other programming languages.
– init() runs automatically as we do not need to call this method.
– All methods other than init() will be executed only when they are called from somewhere in a program.
– For every object, init() method will be get called once. So, if we create two objects then the init() method will execute two times.

#2
– When an object of a class is created, the class is said to be instantiated. It is also known as object creation.
variable= class_name()
An object of that class will be created.
– We can pass arguments to a class in the constructor itself for their execution.
– Values of arguments can be accepted in a class in the init() method as its parameters.
– The variable name of the object is passed automatically and gets accepted by the self in the init() method.
class Computer:
def __init__(self, CPU, ram):
–(statements)–
com1=Computer(‘i5′, ’16’)

#3
– So, in actuality when the object is created, first we pass the object itself in an argument and then pass values of other parameters in it.
– Whatever values you passed for different parameters in an object, will be assigned to an object through the self.
def __init__(self, CPU, ram):
– In a class variables are not local variables as they are associated with an object so we have to use the self with variables to fetch the values.
– We bind data with every object so one object will have its own methods and variables.

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