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Hello everybody.

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And welcome back.

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In the previous video.

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We saw how we can use the if l statement in our program.

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Now let's see another statement that we can use which was the false statement.

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So it basically says as it basically does as it says.

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So for something do something.

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Now the basic use of this would be so let me open up my Python interpreter.

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The basic use would be or what we will use most likely is for something in range of a few numbers.

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So let me just show you what I mean.

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So let's say no equals 1 and then we want to do this command right here.

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So for AI or basically for anything for AI in the range of range is basically an inbuilt function.

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So in range 1 comma 10 then we close the parentheses then two dots.

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So let's first explain what this means.

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The range is basically it is saying for some AI variable in the range from 1 to 10.

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So this I will take the values from 1 to 10 do and then your presenter then tab it so we can push it

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forward and just type here.

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No equals no plus I so let's press here enter enter once again and if I just could not type number once

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again you would see that our number is now forty six.

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Now if you did not understand this you are probably all you're probably ask yourself how is the number

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right now 46.

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So let's take our in-depth view on this right here.

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So we first specify our number to be 1 then we specify this right here.

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So for i in range 1 2 through 10 do number equals nine plus 1.

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So for the first for the first circle of this command I will be equal 1.

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So it will then do.

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Number which is 1 equals number plus I.

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Which is then 2 so number is 1 and I is 1 in the first circle.

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And then our number will become 2.

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Then it will go back and then it will do that.

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The AI is now 2.

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So since we already did 1 and now it will be two.

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So now this will be two equals two plus two.

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Since our IDE is now two or one plus two.

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Pardon me.

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And then it will do it all the way through 10 and then it will give us the output of all the added numbers

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together of which is forty six.

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So that is how the for loop works.

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Now let's see how we can also use it in order to for example increase all the numbers in the list.

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Now we didn't really cover the list yet but just type what I do so let's make our third program.

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Now I know Python 3 but by we specify the path I will not say why anymore since I did it already twice.

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And right now I have to specify the path we want to print to make a list.

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Now our list is basically a list of different strings or different numbers.

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In our case we will use a list of strings so no underscore based.

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We'll call it like that.

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You can call it anything you want and we specify lists with these brackets.

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We do not the normal brackets but with these brackets right here and then we specify the numbers in

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our list which would be 1 2 3 4 5.

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And then we close the brackets.

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So this is how you specify a list.

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You can put any numbers here you want divided by the comma.

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And right now what we want to do is use our for loop in order to for example increase each number from

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list by 1.

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Now how do we do that.

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Well it's a little bit different.

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So do most of the commands is actually the same.

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So what we want to do is for i in range and we want to open up our brackets but not type here the range

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we want to type your length since we want the length of this list right here to be the range of our

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loop.

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So for I enrage and then open brackets Len with 10 which stands for Len and then the length of our number

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list.

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No list then we need to call those two brackets and then put these two dots right here so this basically

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says for any number or not for any number for some variable i in range of the length of number lists

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we want to perform the number list

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of I plus equals 1.

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Now I will explain what this does in our future lectures for non.

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Just trust me that this will actually increase the numbers in our number list by 1.

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And if we printed the N number list

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and save this.

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So control X to exit c h mode plus X in order to make it executable and then we run the Python 3 you

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will see that I did the number list is no longer one two three four five.

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It is now two three four five six.

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So basically that is the simple use of the for loop.

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Now don't be worried about these lists right now.

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We will cover lists later on for now.

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I just want to show you what this can be used for.

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So for example if you had a list that is too large you could with this simple two line code change the

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values of all of those numbers in the list or in basically in our case increase them by 1.

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So for loops and if loops are very useful you will also see in the next videos Why yes.

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I basically only show you some of the most basic examples.

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They can be even more useful than this but for now on this would be enough in the next video which will

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cover a while loop that we will also use in our backdoor program.

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Well actually that is the most important book since we can specify some pretty pretty good things with

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it.

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I will show that in the next video and I hope you enjoy this one and I hope I see you in the next video.

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So take care.