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Hey, welcome to the first video of the second part of the course you have left past the first sport

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where you learn the basics of Python and you practice the basics and you learned a lot of the main libraries

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to build different applications with Python.

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Now, these applications that we built were mainly smaller applications, but from now on we will build

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larger applications and this time we will use another programming paradigm called object oriented programming,

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or o P for short the programming paradigms we use for where functional programming and procedural programming.

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You are using functional programming when you are using functions in your code to process data and return

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values and so on.

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So for example, here we use functions in our web scraping app, which we built previously.

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And then we also use procedural programming, which means you don't use functions at all.

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You just use lines after lines.

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So we did that with the other apps as well.

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So these programs are more linear, which means you get some input and the way to go to the output is

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quite linear.

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So you process that input and then you produce some output.

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But imagine an app where users can book tickets such as hotel tickets or airplane tickets, and then

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the user can pay for a ticket.

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They can use a credit card, they can do other actions such as cancel a ticket and so on.

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So in such an app, there is a lot of interaction between different entities of the program.

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So between the ticket, the user, the credit card and so on, for such larger programs, you can still

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use functional programming or procedural or programming to build the app.

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But those two paradigms are not the most efficient paradigms to build such apps.

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The most efficient way that professional programmers use to build larger apps is called object oriented

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programming.

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O P and object oriented programming uses classes instead of functions to organize the code.

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So in the next videos, you will learn how to use classes to write programs so that your programs are

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in object oriented programming style or paradigm.

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And that is the ultimate way to program.

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And that will scale up your python skills and everything else will make so much sense.

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So get ready and let's go.

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I'll see you in the next video.