#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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[tejaswibhargava]

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[mnschannel]

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[Adks]

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[Bloodair]

Finally someone explained self properly

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[thepotato]

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[haanjihaan]

Sir, give some assignment problem so that what we are learning can be understand better

[AkhilKumar-bjyd]

I have searched alot about initializer..eventhough in paid websites cant gave perfect concept...But u gaved...absolutely legend..thank u sir

[ricy]

I have to thank you. I was watching another series on Python and was stuck on Classes. This video and your previous video really cleared up when I can use self.attribute when I want to reference attributes when inside my class and when I need to reference the object when it has been created outside of the class.

I will have to run through your other videos to sure up my knowledge. I will definitely be back.

[MrABhitechq]

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[amarnathbr]

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Great Work!
Thank You :)

[alexmckinley]

I've been struggling with this for months. Finally, after this video, I think I understand. Thank you!

[marjun]

last video was awesome and i practiced it like this way:
class manifest():
def man(self):
global a
global b

a=int(input("a value:"))
b=int(input("b value:"))
c=a+b
print('sum
def man2(self):
c=a-b
if a<b:
c=b-a
print("difference is- >", c)

sum=manifest()
#manifest.man(sum)
sum.man()
sum.man2()

[talhatayyab]

One of the best videos on self and OOP concept.
Thank you Sir!

[danielkamau]

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[mrdypk]

AWESOME SIR G...
this may be the first ever tutorial series on youtube that i'll be watch first time completely... thank you...