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Hello guys.

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So we are going to continue a discussion with respect to Python.

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And in this video we are going to see some amazing real world examples using list in Python.

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Now guys you may be using a lot of applications.

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You may be using lot of apps, you know some or the other way.

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They are many, many smaller modules where specifically list can be used.

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So over here I'll be showing you some of the examples.

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Yes.

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We are not going to develop a complete end to end project like kind of thing, but it's more about understanding

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what applications specifically this kind of data structures list is used.

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Okay, so the first example that I'm actually going to do is something called as manager to do list.

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Right.

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So we will try to create a list which will keep the task track of all the tasks that you are planning

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to do.

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Okay.

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So let's say uh, I will just go ahead and create a variable to do list okay.

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And inside this let's say today my task is I have opened my app and I have probably selected okay,

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today I need to buy groceries.

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Let's say I need to buy groceries.

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The second task that I really want to do is that clean the house.

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Okay.

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Which is necessary.

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Clean the house.

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And let's say the third task that I have is something called as pay bills right now.

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Uh, let's say after some time, uh, I had to get some kind of task.

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I had to I got some more task, and now I want to add that particular task to my to do list.

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So right now in the to do list is already a list.

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So we know some of the inbuilt methods that we have already discussed, like how we can make sure that

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how how we can add more tasks in our plate.

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Right.

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So what I will do, I will just go ahead and use this to do list dot append.

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Right.

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And inside this append I can probably go ahead and say okay, schedule meeting is one of my tasks.

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I need to schedule a specific meeting with someone.

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Okay, so this can be one of our task.

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And after finishing my work, let's say I want to go to a run, you know, so I will go ahead and append

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another task over here.

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Something like go for a run, okay.

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Go for a run.

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Okay.

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So this is my another task that I really want to do.

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Let's say that I have done out of all these tasks, I have started my day, and the first task that

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I have actually done is cleaned my house.

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Okay, so what I will do is that after I probably in my app, you know, after I complete this particular

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task, I will make sure to remove that particular task.

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And once I removed write a completed task in the back end, what kind of what kind of code will be written?

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You know, so from my to do list right, which will be in the session, we'll talk more about session

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and all.

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I will just go ahead and remove, uh, clean the house task over here.

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So I will just go ahead and copy this entire thing, and I will just go ahead and say, hey, this is

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completed.

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So please remove this particular task from my list, you know, and then, um, let's go ahead and check,

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okay.

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Whether this particular task after removing it is present or not.

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So here I will say checking if a task is in the list.

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Okay.

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And uh, here I'll say, hey, if let's say pay bills is there okay.

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Pay bills.

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Is there in the task okay.

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In two underscore do list.

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Then I will say print.

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I'll send a reminder for me.

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Hey don't forget forget to pay the utility bills.

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Let's say this is my utility bill okay.

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Utility bills okay.

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So this is just like a reminder that I am actually getting.

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And let's say after finishing all the work, how many tasks I really want to probably, uh, how many

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tasks are remaining if I want to print it.

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Right.

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So I'll just go ahead and write, print.

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This is my to do list that are remaining to do list remaining.

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And I will just go ahead and print for task in my to do list print.

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Let's go ahead and print with the help of F string F is basically a formatting string.

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And this will just go ahead and display my task right now.

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Obviously here I'll be able to see that from my task.

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This clean.

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The house should not be there.

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And I should have this both the tasks that should be appended in my to do list.

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So let me just go ahead and execute it.

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So here you can see, hey, don't forget to pay the utility bills because I got a reminder, a reminder

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saying that over there because pay bills is still there in my to do list, then the remaining to do

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list that are remaining that are like buy groceries, pay bills, schedule meeting, go for a run.

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Right?

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So all this specific things are there and I will be able to keep a track of it so extensively.

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I know in a bigger application you'll be seeing that a to do list specifically uses list, because with

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the help of list you can actually remove it.

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You can add it, you can append a new task over there and everything can be created through it.

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Right?

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So whichever programming languages you specifically go ahead with, list will be a common data structure

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that will be used extensively.

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Okay.

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Now let's go ahead and see another example.

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So here you have something called as organizing student grades okay.

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And now I will just go ahead and copy and paste it over here code for you.

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So here you can see organizing student grades.

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So I have some grades over here 8592 7890, 88.

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So I am adding a new grade.

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Let's say new grade has actually come.

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So I'll go ahead and append a grade inside this.

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Then we'll go ahead and calculate the average grade.

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So this is my average grade.

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Find the highest and the lowest grade let's say by using inbuilt function like max or grades I'll be

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able to get the highest grade and another inbuilt function by min.

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I'll be able to get the lowest grade.

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So this is how I will be able to see my highest and lowest grade, right?

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So such a simple example.

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But here you can also see that extensively list is basically used.

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And just by using this inbuilt function like sum right which will get basically get applied in a collection,

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specifically in a list right over here, you'll be able to see that I'm able to calculate sum of grades,

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length of grades, and then I'm able to calculate the average one.

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Right.

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So this is another one example with respect to organizing student grades.

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And here you can see average grade is so much highest grade is so much lowest grade is so much.

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So that is what I'm actually doing to calculate the average of the students.

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Okay.

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Now one more example that I've actually taken is managing an inventory okay.

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So managing an inventory basically means I'm trying to just manage an inventory.

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Whenever we do an e-commerce site, you know, inventory is the major thing that will be managed by

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the entire company itself, right?

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Uh, so here you can see, let's say in my inventory, I have apples, bananas, oranges, grapes.

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Okay.

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So these are all the items that is present in my inventory.

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And then I'm adding a new item which is called as append strawberries.

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Okay.

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Now with respect to this particular strawberries, this is the new item that has come.

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And I'm appending it whenever there is one item that has been ordered by someone.

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So once we deliver it, we have to remove that particular item.

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So we have removed that particular item called as bananas.

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Let's say bananas was ordered by someone.

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So I have just removed this.

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Okay.

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After the, you know, delivery is done checking if an item is in stock.

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So if I'll say item is equal to oranges, if this item is present in inventory, I'll go ahead and say

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hey, they are in stock.

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Otherwise they are out of stock.

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You know then we can go ahead and print the inventory.

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So here you are able to see that we are able to manage everything in the form of list.

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Yes.

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The scale of data will be quite huge.

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But internally this is all data structures will be specifically used.

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So this is another one amazing example.

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So if I go ahead and execute it here you can see oranges are in stocks.

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Since orange was already present over here.

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And then inventory list you can actually find apple oranges grapes and strawberries.

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Okay now this was one more example, a good one.

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Now I hope you are able to understand what are beautiful.

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Use cases are definitely there.

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Now this one, uh, I'll just give you the task.

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Please go ahead and explore it.

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Okay?

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And, uh, just try to see whether you are able to understand it or not.

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Okay.

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So this is the code collecting user feedbacks.

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Use a list to collect and analyze user feedback.

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So here is my user feedback.

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Great service.

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Very satisfied.

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Could be better.

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Excellent service.

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Let's say another feedback is had added not happy with the service okay so we are just counting the

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specific feedback.

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So I'll say one for comment in feedback.

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If great in comment not lower.

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Okay now see here.

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We have also used something amazing right?

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So I'm saying for comment in feedbacks we are exploring it.

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Okay.

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If a great word is present in that comment okay.

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If in all these comments great is present.

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So we are just going to do the summation with respect to one.

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Like if any time great is present, I'm going to take one right or excellent in comment.

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All right.

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So we are just going to do how many number of time great or excellent is present.

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We are just going to keep on adding it up okay.

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Okay, so here you can see positive feedback count.

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We are able to get.

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So this is the variable.

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And then finally you can see print user in feedback comments and feedback.

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And we are printing it.

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I hope you are able to understand.

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So over here with respect to the output positive feedback count is two.

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That basically means if great and excellent is present over here, we are just going to count it down.

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Okay.

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So two times we have actually found out.

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So user feedback are like great service.

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Very satisfied.

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Could be better.

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Excellent experience.

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And the last feedback was not happy with the service.

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So that is also appended over here.

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So these are some of the beautiful examples.

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And again list is something I think the most common data structures that may be used everywhere.

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You know probably whenever we are working with larger applications.

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So I hope, uh, you understood this video.

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I hope you got an idea with respect to the real world example, and this was it for my side.

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I will see you in the next video.

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Thank you.