#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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