Original subtitles

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So you should see a day 2.3, Your Life in Weeks

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and this is the challenge that we're going to complete in this lesson.

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The idea is that there's a really great article by Tim Urban of wait

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but why on visualizing your life in weeks.

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And I was reading this recently and it really made an impact on me,

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especially when you see that a whole life from age zero to 90 can be mapped out

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like this in weeks where every week is represented by little check box.

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And you can see each of these boxes, right?

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This is like how many weeks you have in your whole life.

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And it's not as small as I thought it would be.

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I thought each of these boxes would be like invisible because they're so tiny

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because I have so many weeks in my life. But it's actually not true.

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There's actually not that many. So in today's coding challenge,

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what I want you to do is to create a program using the mathematical operations

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that you've learned about as well as the f-strings that you learned about in the

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last lesson to tell us how many days, weeks, and months we actually have left

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if we were lucky enough to live until 90 years old.

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The code is going to ask you for your current age,

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let's say that I'm 12.

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And then it's going to calculate the number of days,

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weeks, and months you have left in your life

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if you lived until 90.

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And then it's going to print it out to you like so.

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And the important premise of this code challenge for all of the tests to pass is

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that there are 365 days in a year,

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52 weeks in a year and 12 months in a year. I know that because of leap year,

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it's actually a little bit more than that. But for this exercise sake,

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let's just call it for 365, 52 and 12.

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Pause the video and see if you can complete this challenge and then head back

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over here and we'll walk through the solution together.

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All right. How did that exercise go? I'm sorry

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it's a little bit dark making you think about how many days, weeks,

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and months you have left in life, but you can think about it as a motivation,

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right? If I only have 400 months left,

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I don't know if I want to spend one of those months just watching game of

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Thrones. Maybe I want to do something for other people.

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Maybe I want to create something. So how are we going to calculate this?

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Well, we've got a hold of the age from the input,

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but you might remember from previous lessons that the input always creates a

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string datatype. In order to do math,

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we do still have to do a type conversion.

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So we have to change our age into a number. So let's call it age_

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as_int. Age is never going to be a float, right?

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Because not many people are going to tell you that they are 56.4 years old.

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So we're going to accept this as a whole number.

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So we'll convert our age into an int.

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Now the next stage is we have to do some calculations. We have to calculate,

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um, the number of years left, right?

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So let's call it years_remaining and that's going to be equal to 90,

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so we're presuming we're going to live to 90, minus age_

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as_int. So now that we've got the number of years remaining,

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we can calculate the number of days, weeks, and months left.

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So days_remaining is going to be equal to years_remaining multiplied by

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because there are 365 days in a year.

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And then we can do the same for weeks,

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and months.

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So now that I've got hold of the number of days remaining, weeks remaining and

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months remaining, then I'm ready to actually use it inside my string.

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But before we do that,

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it's always helpful to check your code as you go along to make sure that it

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works exactly as you expect it to.

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So let's go ahead and try to print what is the number of months remaining.

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So if we go ahead and run our code,

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and let's say that we're 80 years old, right?

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Which means that we'll have 10 years remaining and we will have 120 months

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remaining. So all of that looks pretty good to me.

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So the next thing we have to do is to somehow output the sentence where it says

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you have X days, Y weeks and Z months left.

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So let's copy that and paste that sentence in here.

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And then I'm going to turn it into a string by wrapping it inside a set of

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double quotes. Now that I've got a string,

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I can turn it into an f-string by putting the character F before the string.

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And instead of having X, Y, and Z,

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I can replace them with some curly braces inside of which I can put my variable

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names. So I'll change this to days_remaining,

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this to weeks_remaining,

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and this to months_remaining.

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And now that I've got my string, I have two options.

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I can either just wrap this inside a print statement and print it as it is.

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But what I think might actually make it easier to read is to save it inside a

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separate variable, called message. And then in the next line,

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I can simply print my message. It does exactly the same thing,

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but I think this is a little bit easier to read.

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So now let's go ahead and run our code and see if we get any errors.

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It's asking us for our current age, let's say we're 67 years old. Well,

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then we only have 8,395 days and 1,196 weeks and 276 months.

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So I hope you managed to get this code challenge right.

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And even though the challenge is a little bit dark, well,

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at least remember that when you become a really good programmer,

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you'll be able to cut down on a lot of the boring things and repetitive tasks in

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life. So at least you will be claiming back some of those days, weeks,

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and months.

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So I hope you had fun with me on this code challenge. In the next lesson

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I've got a quiz for you. So head over there and to give it a go.