Original subtitles

So you should see day 2.3 Your Life in Weeks, and this is the challenge that we're going to complete

in this lesson.

The idea is that there's a really great article by Tim Urban of Wait but Why on visualizing your

life in weeks.

And I was reading this recently, and it really made an impact on me, especially when you see that

a whole life from age 0 to 90 can be mapped out like this in weeks where every week is represented

by a little checkbox and you can see each of these boxes right?

This is like how many weeks you have in your whole life, and it's not as small as I thought it would

be.

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

I have so many weeks in my life, but it's actually not true.

There's actually not that many.

So in today's coding challenge, what I want you to do is to create a program using the mathematical

operations that you learned about, as well as the fstrings that you learned about in the last lesson

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

if we were lucky enough to live until 90 years old. The code is going to ask you for your current age,

let's say that I'm 12, and then it's going to calculate the number of days, weeks and months you have

left in your life if you lived until 90. And then it's going to print it out to you

like so.

And the important premise of this code challenge for all of the test to pass is that there are 365 days

in the year, 52 weeks in a year and 12 months in a year.

I know that because of leap year, it's actually a little bit more than that,

but for this exercise sake, let's just call it 365, 52 and 12.

Pause the video and see if you can complete this challenge and then head back over here and we'll walk through

the solution together.

All right.

How did that exercise go?

I'm sorry, it's a little bit dark making you think about how many days, weeks and months you have left

in life, but you can think about it as a motivation, right?

If I only have 400 months left, I don't know if I want to spend one of those months just watching Game

of Thrones.

Maybe I want to do something for other people.

Maybe I want to create something.

So how are we going to calculate this?

Well, we've got hold of the age from the input, but you might remember from previous lessons that

the input always creates a string data type.

In order to do your maths, we do still have to do a type conversion, so we have to change our age

into a number.

So let's call it age_as_int, age is never going to be a float, right?

Because not many people are going to tell you that they are 56.4 years old, so we're

going to accept this as a whole number. So we'll convert our age into an int.

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

We have to calculate the number of years left, right?

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

so we're presuming we're going to live to 90, minus age_as_int.

So now that we've got the number of years remaining, we can calculate the number of days, weeks and

months left.

So days remaining is going to be equal to years remaining multiplied by 365 because there

are 365 days in a year, and then we can do the same for weeks.

And months.

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

I'm ready to actually use it inside my string.

But before we do that, it's always helpful to check your code as you go along to make sure that it

works exactly as you expect it to.

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

So if we go ahead and run our code and let's say that we're 80 years old, right?

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

So all of that looks pretty good to me.

So the next thing we have to do is to somehow output this sentence where it says you have x days, y weeks

and z months left.

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

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

Now that I've got a string, I can turn it into an fstring by putting the card to 'f' before the string.

And instead of having x, y and z, I can replace them with some curly braces inside of which I can

put my variable names.

So I'll change this to days_remaining, this to weeks_remaining and this to months_remaining.

So now that I've got my string, I have two options: I can either just wrap this inside a print statement

and print it as it is.

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

message.

And then in the next line, I can simply print my message.

It does exactly the same thing, but I think this is a little bit easier to read.

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

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

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

So I hope you managed to get this code challenge right

and even though the challenge is a little bit dark,

well, at least remember that when you become a really good programmer, you'll be able to cut down

on a lot of the boring things and repetitive tasks in life.

So at least you'll be claiming back some of those days, weeks and months.

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

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