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Python 3 OOP Program to Add Two Numbers Using Classes & Objects in Terminal Tutorial For Beginners
Jun 1, 2025
Get the full source code of application here:
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0:00
uh hello guys uh welcome to this video
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so in this video i will show you how to
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add two numbers inside python using
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object- oriented programming using
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classes and objects so actually this is
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actually a python program i
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uh written right here if
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i just run this program python app py
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you will see it will actually print out
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the sum which is 25 and 15 so these are
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the two numbers we are passing in this
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program and the sum is printed out which
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is 40 so i will show you step by step
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how to write this program this is ask
0:39
inside interviews in competitive
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programming as well so just create a
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simple app py file
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and the classes we actually declare it
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using this keyword class and here
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followed by the name of the class so
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like this if you see we declare this
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class keyword this is the name of the
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class and inside this you actually
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define every class contain this init
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function so this init function
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specify actually you can say it's a
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constructor so whenever in java or
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javascript it's called as constructor
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but in python it's called
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as_init_ so we are passing these initial
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parameters right here which is self and
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these two parameters a comma b so now we
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just need to in initialize it the value
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of self dot a and whatever the value is
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passed we will just equal to like
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this so this is your constructor so this
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constructor function will automatically
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be called whenever you make the object
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of this class
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adder so now if i make an object right
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here if you
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see of this class i will simply say
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instantiate a new object of this class
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and here we just need to provide two two
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variables that we need to add so 10 20
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so here essentially what we are doing
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this we have declared a python class and
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here we are making an
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object and uh we are passing these two
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values which is 10 and 20 like this 10
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and 20 so this will be initialized right
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here and after that
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uh after we make an object we now need
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to declare a simple function inside this
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class which will be responsible for
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adding these numbers so you can actually
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define a function right here again with
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the defaf keyword let me say
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add and now to access these two
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variables which are there inside this
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self variable that you
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see so we have initialized this self
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variable now to access it we do need to
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pass this reference of self and now we
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can easily
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access so we can simply say self do a
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plus self do.b b so we are just doing
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the addition of these two numbers that
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is passed here 10 20 so we are
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referencing it so this is a function
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inside the class so using this self
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variable we are accessing a and b and
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then we are doing this addition and
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returning to this
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function so now this is a object now to
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actually call this function we will
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simply
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say we will call this function by using
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this object so this contains this
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function right here you can see it is
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appearing it in the drop-down so this is
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essentially this function we call this
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function parenthesis that's all if you
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do this now you will see that sum will
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be printed out which is sum is equal to
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30 you can see 10 + 20 comes out to be
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30 so in this easy way you can define a
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series of functions let's suppose i
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write another function which will be
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responsible for subtracting two numbers
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so this will actually return the minus
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so what we can do we can write another
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thing which is
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subtract and here we can call adder dots
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subtract so this this will essentially
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subtract these two numbers so the result
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comes out to be minus 10 so this is the
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logic how which we can declare a program
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python program using classes and objects
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you declare a class right here it has a
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constructor or initialization function
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and then you can write a series of
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functions which will be responsible for
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certain things then we initialize this
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class makes make an object and then we
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call the series of methods like this so
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this is the way by which you can
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initialize
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it thank you very much for watching this
5:09
video guys and also check out my website
5:11
freemediatetools.com
5:13
uh which contains thousands of tools
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