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All right. So let's begin by talking about lists.

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Now, lists aren't anything new to us.

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We've actually worked with quite a few lists already.

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We've had lists of names, lists of cars and so on.

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But the one thing about lists is that they are what we call mutable,

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meaning that the items or elements that you have in a list,

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we can actually modify them, right?

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So we can add to the list,

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we can remove from the list and we can modify

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whatever elements that already exist within that particular list.

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Now, over here,

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I do have a list of compromised passwords.

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So you know the usual password, 12345, Qwlty and so on.

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Now, I want to show you a

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few things that we can do in here, right?

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I can say print,

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ok. And now in brackets,

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I can call the list, compromised passwords.

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And now I can provide the index number

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of the item that I want to list. In this case. Right now, it is

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index number zero.

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If I run my program, you can see that's going to be password.

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So the first thing I want you to understand is that the items in a list,

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they all have index numbers starting from zero.

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So if I was to print index number two, what do you think the answer would be?

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Yep, it's gonna be QWE rt Y

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OK.

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That's the first thing I want you to understand.

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Next is the fact that we can perform various types of functions on our list.

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For example,

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I can say, let me call the list again

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And now

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I can add this function here called append

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a pen right here

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in technical terms is what we refer to as a method.

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Methods are also functions,

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but they are very special kinds of functions. We'll talk about methods a bit later.

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But for now, just understand that we do have very special functions,

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functions that are called methods

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that you can apply directly onto lists and they will do something.

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So right now,

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what a pen would do is that it will add whatever new item you want into our list. So

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as an example, I can open up my brackets

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and let's say we add a swordfish,

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OK? This is

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a very, very popular

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pages

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by a lot of people.

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OK?

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So I've appended salt fish to the list.

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So if I go back right now and I print my compromised passwords,

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you can see salt fish has been added to the list. So this is the very first

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a method of function. I want you to understand that you can use with your lists.

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The next one is going to be what we call the extend

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function.

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See a

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pen with a pen, you can add,

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you know, individual items, elements and so on. With extend,

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you can actually add all elements from another list.

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So as an example, I have my first list right there, uh compromised passwords.

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And let's say we've created another list

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of compromised passwords.

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Ok.

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Equals and now let me open up

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the brackets in here

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and let's add some fresh batch of passwords.

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Let's see, we have what are the very common passwords people often use?

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Ok, let's say 123 AB C.

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How about that?

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And let me add

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one more

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and let's call that one dog cat Bone,

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you know, just something. All right. Ok. So we now have two different lists, right?

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One for the compromised passwords and then

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another for the new compromised passwords.

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So check this out. Ok, I can come here right now

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and say

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compromise passwords and now extend

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and now in brackets,

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I can say new

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on this

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compromised password. So basically

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I am attaching the new passwords into the old passwords list.

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And now if I run my program,

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now you can see that 123 AB C and Dog

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Cat Bone have been added to my compromised passwords list.

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Now,

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another method I want you to be aware of is going to be quite the opposite of append,

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which is going to be remove.

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So let me first of all

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cut out

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our first or second list rather

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and I am going to modify this line right here and then say

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remove.

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And now in brackets,

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just as an example, I can provide

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what I want to remove, which is 12345.

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So let's say I wanted to remove this particular element. Very, very easy.

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I'll just say that remove, run.

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And now you can see that 12345 is no longer

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in the

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coin passwords list. So very, very straightforward.

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Another one we can do is to simply clear,

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we can clear the entire list as an example. So if I was to come over here right now,

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change, remove to clear.

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All right, I don't need to have anything inside the brackets.

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So just clear and if I run,

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there you go,

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it is going to be empty. There is nothing inside of the list any more.

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So there's quite a few other methods that you can work with.

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I think it's about 11 of them.

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But let me give you two more.

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Another more we can use is going to be a reverse.

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All right. So basically what this will simply do is that it will reverse

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the items in the list. The order is going to reverse the order. So if I run this,

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there you go, it starts from

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uh let me in and goes backwards all the way to password

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and then one more

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that I want to show you that can be very useful would be the copy

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method. So

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as an example over here,

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let me just come right here and I'll create a backup. Ok? So

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backup and let's say underscore accounts,

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ok?

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I can assign the backup to my variable backup

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account and I can now say equals and now compromised

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uh passwords

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and now dot

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copy

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and now in brackets.

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All right. So basically what I'm doing right now is I would like to make a backup

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of this list, this compromised password list and then assign that

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to the variable backup accounts.

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So now if I was to print

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the backup accounts

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and I run,

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you will see right now that we have the exact same

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list, the exact same item. So

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this is what you would use to create backups or copy

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the items in a particular list.

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So, like I said, you do have a few other ones like salt pop and so on.

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We're going to talk about methods a bit later in the course.

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But for now that's the introduction to lists and the

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methods that you can use to work with them.

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Thank you for watching. I will see you in the next class.