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Hello guys.

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Welcome back to another class of our course but the complete introduction to Python showing today's

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class we are going to still talk about lists.

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We talked about lists.

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We talked about list list functions and everything.

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And did they score this topic will be a bit in the same.

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Well we are going to talk where we are still going to talk about lists but we are going to talk about

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a little bit different type of lists.

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And in this case it will be couples.

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So to understand what is the difference between a normal list and a normal table and a table I will

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simply write down a list right here.

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So let's say we are creating a list of colors.

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So in this case we'll write down let's say red

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then write down yellow

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and we'll write down.

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All right.

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So we have our tree colors and what we can do with this list.

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Well we can run the app so you can see works works perfectly just print it to make you run.

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So we print our list.

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All right.

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If we run it as you can see works perfectly we can do many things what we can for example if we want

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to insert something we can insert so we can write down insert and let's say I want to insert something

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at the segment the column so let's say I want to consider pink.

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All right.

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I run my app.

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It will work perfectly.

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But when I have it's awful what's the difference between a list and it's Apple is that I can play with

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all the things that I have in my list but when I have a table for example I can modify it at all.

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So let's say for example with a list I can insert I can insert new colors I can delete colors I can

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what I can do I can do well I can do many things but with topples I just can't modify it I can't add

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nothing I can delete nothing and I have to respect.

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Well it's the it Apple.

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It's simply a list that you can't modify.

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You can put topples into lists but you can't modify topples by themselves.

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So we just show you a quick example.

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So right now this is our list.

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So when we want to write it's up on how we write that topic at first I'll write it down the same way

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as we write a list.

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So when you write the list we write let's say for example write down colors so we'll click on equal

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and we will use those parentheses right here for example we'll use the basic parentheses and we will

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let's say write down our colors.

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So once again we'll write down blue

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yellow and red

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and red.

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All right.

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So we have all our colors.

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If we print if we run our app.

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So once again we run our app which will run our colors so works perfectly we have our colors right here.

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But let's say for example I want to add something.

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So in this case I want to insert so I'll write down my insert function

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I want to insert something at the second place 0 0 1 2 right here instead of red.

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I want to add.

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Let's say I want to add the black.

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All right.

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I run my app and look exactly what's going to happen.

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So as you can see I have an error message and it's written right here topples object that has not achieved

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youth in sir.

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So you just can't modify it.

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You can't use it.

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You can't use no modifications in two couples.

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And as I explained you can have a list of tables so let's say for example right here I have colors let's

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say I'll Have Another.

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Another couple of.

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In this case shapes.

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So I'll have for example square I have a triangle and I will have a circle.

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All right.

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So I have my shapes and I have my colors.

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Now let's say I want to create a list of those couples.

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So in this case I can write down let's say list and what I want to do is simply add colors

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and shapes so my list will be will be constituted with colors and shapes.

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And if I run it just print everything

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presidency.

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I have my couple that will have blue yellow red and my shapes as well.

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So as you can see my list will have the couples that are that are here.

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So I have a list of top.

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So it's possible to create a list of top all but it's very important guys that you understand that the

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main difference between couples and lists is simply that couples can be changed.

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OK.

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Right now in what exactly and what exact moment can you guys.

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Well what exact moment can you guys guess when you can only use doubles but not a list.

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So basically you want to use couples on things that you know will never ever ever change.

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So let's say for example you want to you want to look for the address of someone.

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So the address of this person will.

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Well it can change but it will not necessarily change in the near future or something even let's say

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easier.

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You want to look for the coordinates of a place in the world let's say you want to look for the coordinates

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of a mountain or at a certain county a country or a certain city.

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Well you know that those coordinates will never change.

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So you can store those and two tables so let's say we want to store one of those into couples.

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So in this case we'll write down let's say for example a city let's let's say Paris.

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So we have pirates Paris called coordinates.

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So equal and let's say Write down the coordinates of Paris.

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Once again let's say the coordinates of Paris will be 135 124.

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Once again it's just an example.

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And as you can see it's it will never it will never change.

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Let's say you want to store the ad in the IP address of something we're out of a place.

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Or just store the address IP of a certain device while you will store it in a temple because a IP address

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will not change or you don't want it to change at least as a.

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You don't want to change.

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So you have things that you never want to change everything that you guys think will never change or

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you don't want it to change.

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You store it into a couple and everything that will change so it could be variables we can store those

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into a list.

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So this is the main difference.

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So that's it for this class guys right now you understand.

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You know another type of list which are couples and you'll see it's going to be very useful for our

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by learning.

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So that's it for this class guys.

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And see all in our next class.