Lecture 78: List Comprehension in Python

Nafees AI Lab

List comprehension in Python offers a concise way to create lists based on existing iterable. It provides a more readable and often more efficient alternative to traditional for loops when constructing lists.

Transcript

00:00List Comprehension

00:02List Comprehension

00:04List Comprehension

00:06List Comprehension

00:07Concept

00:08First

00:09I am going to get a exercise

00:10So you will know

00:12Where are we going

00:13Where are we going

00:15Exercise

00:16You will create a list

00:18Using for loop

00:201 to 10

00:22Very simple

00:24List 1 is equal to

00:27Empty list

00:28For i in

00:30Range

00:3110

00:32And then

00:33You can do this

00:35Li-1

00:37Append

00:38Append

00:39Append

00:40Append

00:41Append

00:42Print

00:43Li-1

00:45List

00:46List

00:47Print

00:481 to 10

00:49You can do this

00:51You can do this

00:52You can do this

00:54Very good

00:56Excellent

00:57Now

00:59Question

01:00My question

01:01Is

01:02Which way

01:03We can do this

01:04Compact

01:05Compact

01:06Comprehension

01:07That means

01:08You can do this

01:09In English

01:10Literature

01:11You can do this

01:12Comprehensive paragraph

01:13Comprehensive

01:14Comprehensive

01:15Comprehensive

01:16Comprehensive

01:17Comprehensive

01:18Comprehension

01:19Basically

01:21What you do

01:22Is

01:23That

01:24We have to do

01:25Single statement

01:26And

01:27How is

01:28The

01:29Keep

01:30Self

01:31Comprehensive

01:32I have to

01:33Do

01:34For

01:35To

01:36This is what we have, this expression is not a variable, this is a variable, this is a expression,

01:45this is a expression, so this is a expression.

01:49So what do we need to do? List in the expression.

01:54List in the expression.

01:56What do we need to do?

01:58Then we need to do for loop.

02:01I remove this for loop.

02:05For loop is not a problem.

02:10That's it guys.

02:12Now print li1.

02:14Li underscore one.

02:17Execute.

02:18Kaboom shakala.

02:20Same result.

02:21Over to know.

02:22Maza aya ki nahi?

02:23A single line ke anndar hemne kam kar diya.

02:26This is case one.

02:28We use the expression to a variable.

02:32I'm going to divide it.

02:33I'm going to divide it.

02:34How many parts are?

02:35Basically.

02:36In a list comprehension case one, there are two parts.

02:39Here I'm going to divide it.

02:41This part is basically loop.

02:45However, this part is the expression.

02:47By the way, this part is the expression.

02:59Expression.

03:00Loop.

03:01Expression.

03:02Those parts are the two parts, expression and loop.

03:04Okay, this was the first case.

03:08In this case, we have to use the expression go single as a variable.

03:11Now, I have a question for you.

03:14You can create a list of 0 to 9.

03:18You can create a list which is 0 to 9 square.

03:23This is very cool.

03:25You can say, sir, this is my hand-hand.

03:27You have to ask questions.

03:29You can give it a try.

03:33Otherwise, follow me.

03:35List 2.

03:35You can create a list.

03:38For I in range.

03:41Range is 10.

03:43Then, you can create a list of li1.

03:46You can create a list of li2.

03:49You can create a list of li2.

03:50And the i is square.

03:54And then print it.

03:56You can create li2.

03:57Li underscore 2.

04:01You can execute a list of li2.

04:03You can use a list of li3.

04:04This is the very cool.

04:07This is the very cool.

04:08Very good.

04:09This is the case 2.

04:10If I say that if you want to list comprehension, how do you do it?

04:16Now look at this loop, I will break it in list comprehension.

04:19List comprehension, which list has created.

04:22This list has created.

04:23Empty created.

04:24This is the expression.

04:27You can put it here.

04:30This is what we have done with variable mic.

04:35Next is the loop.

04:37You can put it here.

04:39This is the redundant code.

04:44This is the same.

04:46This is the same.

04:50This is the same.

04:52This is the same.

04:54This is the same.

04:56This is the same.

04:58Very easy.

04:59Now I will iterate on list comprehension.

05:02This list has two parts.

05:05This is the same.

05:07This is the same.

05:08The next one is the expression.

05:10This is the loop.

05:12I want to say that I will say loop.

05:16This is the expression.

05:18This is the expression.

05:20This can be any same.

05:22You should note that this is a full flag expression.

05:27Here I am just multiple by two.

05:29This is two parts.

05:31At the moment, we have two parts.

05:33Good.

05:35The first case is just variable.

05:38The second one is just expression.

05:41Now, the third question is about you.

05:42Ready?

05:44Now, I will answer one Pepsi bottle.

05:49The question is this.

05:51Now, if you want to generate this list,

05:55you can select even.

05:58You can filter me.

06:00I will use the filter function.

06:03But if you want to use the filter function,

06:05you can select if you can.

06:07You can select even number.

06:10Let's start with Pepsi bottle.

06:13Otherwise, let's get started.

06:15Let's create a list list 3.

06:18This is empty list.

06:19So, very good.

06:22Now, what do we do?

06:24We have basically, we have to do this.

06:27We have to do this.

06:29We have to do this.

06:30We have to filter out.

06:32Okay.

06:33Now, let's do this.

06:35Okay.

06:54sqr i sqr i sqr

06:58okay

07:00I

07:02I

07:04I

07:06I

07:08I

07:10I

07:12I

07:14I

07:16I

07:18I

07:20I

07:22I

07:23I

07:24ah

07:38I

07:40I

07:42I

07:44I

07:46I

07:47I

07:4936, 64.

07:50You have a list.

07:52Which is?

07:53Even number.

07:54Very good.

07:57Now, what are the code?

08:001 loop, 1 conditional, 1 operation.

08:043.

08:05This is case 3.

08:07Now, this is the list comprehension.

08:10Now, we will have a list comprehension.

08:12Magic.

08:13This is a Pepsi bottle.

08:15You have to have a Pepsi.

08:17I will have a Pepsi.

08:20Now, I will have this list.

08:22I will have this list.

08:24I will just go ahead and get to it.

08:26You can take a machine.

08:27You can also take a machine to add.

08:29So, you can turn the sonraki on the other end.

08:31This is a list.

08:33I have this list to create.

08:35Next is the expression.

08:38If I have an expression, I will remove you.

08:40I will remove it.

08:42Now, this expression.

08:44Now, this expression,

08:46I told you that the for loop is a good thing.

08:48Yes, it's a good thing.

08:50For loop.

08:52For loop on the for loop.

08:54For loop on the for loop.

08:56If we have a for loop on the for loop,

08:58we can execute it and then execute it.

09:00Then perform it.

09:02For loop on the for loop.

09:04For loop on the for loop.

09:06This is not a good thing.

09:08I will do it.

09:10Here you have.

09:12This was original code.

09:14This is a list comprehension code.

09:16Very very simple.

09:18Execute and the result will be exactly the same.

09:22This is a list comprehension result.

09:24This is a normal result.

09:26Right?

09:28I will break down.

09:30A list comprehension of three parts.

09:34I will divide them.

09:36First, second and third.

09:38First, second and third.

09:40First, second and third.

09:42First, first.

09:44The first is the expression.

09:46The second is the loop.

09:48The third is the condition.

09:50Now, you'll use the condition.

09:52The condition will not be done.

09:54The condition will not be done.

09:56The condition will not be done.

09:58However, the expression or loop are a list comprehension.

10:02However, expression and loop

10:04are a list comprehension

10:06of a list comprehension.

10:08This expression and loop

10:11can be a list comprehension.

10:14This is clear.

10:16Very good.

10:18This is a list comprehension.

10:22This is clear.

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