All language subtitles for 30. Exercise Functions

All right.

It's exercise time.

Let's combine everything that we've learned into this challenge.

What I want you to do is to create a function called the highest even and this function is going to

take a list data.

And this function for now we'll just pass.

But I want you to fill in this part with whatever you think is going to allow us to achieve this.

If I do print highest even and I give it a list of let's say 1 2 3 4 8 I want the highest even to be

printed in this list.

And actually let's do 10 here.

So the highest even number in this list is 10 just for fun.

That's at eleven as well.

So the answer should be printed here as 10 so based on everything you've learned so far.

Try to fill this part so that you create your own function.

Hi Stephen pause the video here.

Give it a try otherwise I'm going to go with the answer.

So what I want to do here.

Let's think about this is I want to make sure that first of all we only consider the numbers that are

even in here so maybe what I'll do is create a new list called evens and events is going to be an empty

list for now but I'm going to populate this with all of the even numbers so I'm going to remove three

and 11 from this so let's do that.

I'm going to say for item in ally if item modulo 2 equals zero which means it's going to be even then

I'm going to even append the item.

So I'm going to add it to this new list.

And then finally in here once we have the Evens list I want to find the highest number.

Now you can do this manually and go through it one by one or Python comes with a nice function called

Max.

And as you can see we give it an interval and it'll tell us what the max number is in our case we can

just give it evens and remember we want to return something from this function.

That is what is the highest number.

Well we want to return whatever the max of the Evens is.

If I run this I get 10 awesome looks like it's working.

Now some of you may have gotten tricked and tried to return inside of the four.

But if we do this remember that this still works but we actually return from the function when we hit

our first item.

If we had another item let's say two in here and I click Run we get two and why is that.

Because I'm returning when we loop the first time through our item which will be two is to an even number.

Yes it is.

So we're going to append and then we're finally returning Max evens which only contains the item two.

So you want to make sure here that the indentation really matters and if you're returning something

from inside a loop you want to make sure that that's your intended behavior.

You usually want to loop through something and then return.

So make sure you don't prematurely exit the loop nice and simple.

Remember your answer may be different than mine.

There are many ways to go about this but hopefully by practicing this you have a better idea of functions.

We now have a great utility function highest even that we can use all over our program.

Good job getting this far and I'll see you in the next one up.