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Are you looking to find true love?

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Well, this coding exercise will be able to help you

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with just that.

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This challenge is to create a love calculator.

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You're going to write a program that tests the compatibility

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between two people.

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It doesn't really matter if you believe this or not,

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we're going to use it to test out our programming skills.

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There are many ways of working out the love-score

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between two people,

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and if you've ever been to high school,

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you might have encountered one of these methods.

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This method that I've put into this coding exercise comes

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from the well-known and well-established, respectable source

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of a Buzzfeed article.

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And essentially, it works like this.

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So you take both people's names and you check

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for the number of times the letters in the word true occurs.

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So, T-R-U-E

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and then you check for the number of times letters

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in the word love occurs, so L-O-V-E, and then,

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you combine these two numbers to make a two digit number

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and that is your love score percentage.

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What we're going to do is we're also

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going to give people an interpretation.

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So if their love score is less than 10 or greater than 90,

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then we're going to send them the message

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saying, "Your score is *x*

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you go together like coke and mentos."

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And then for people with a love score between 40 and 50,

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which is kind of on the fence,

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we say, "Your love score is *y*, you are all right together.

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And then finally, if none of those conditions are true

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and people are sort of somewhere

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between 20 and 40 and 50 and 90,

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then we'll just tell them, "Your score is..." whatever it is.

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If you take a look in the description box,

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you'll see an example of how we've worked out

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name1, which is my name and name2,

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which is Jack Bauer.

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And you can see that T-R-U-E occurs a total

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of 5 times in both of our names,

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and L-O-V-E occurs a total of 3 times

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in both of our names

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and so the final love score is 53, which is neither here

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nor there, which is not fantastic, but hey,

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it is what it is.

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And so that means our program

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is just simply going to print out the score.

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"Your score is 53."

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You can take a look at some other examples that I've got

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in here to check against,

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and also I've got some hints in there

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and some scores for different names.

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This is a difficult challenge, and as I said before,

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if you get stuck on logic, try writing out

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your own flow chart program

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before you actually go and commit it to code,

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otherwise, just try things, test things, see if it works

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and you can try out the different variations

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at the bottom of the description pane, Brad Pitt,

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Jennifer Aniston, Prince William,

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Kate Middleton, et cetera, and make sure that your output

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matches the score that's shown in that table.

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And this is just to help you make sure

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that your code is working. And when your code is working, 

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then also you have to make sure that your output

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matches what the description pane wants it to say exactly,

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so the interpretations. And I recommend just copy

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and pasting some of those interpretations

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and substituting the parts appropriately.

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So, good luck and enjoy.

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All right.

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Firstly, we know we get hold

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of the name1 and name2 in our variables name1,

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name2 on lines two and three.

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And what we're going to do

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on line five is to combine these two names together

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so that we have just a single string to check.

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We write combine names equals name1 plus name2.

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The next step is to take all of the characters

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and make sure their casing is the same

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as what we're going to check it against

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because the user might have typed in capitalized names,

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they might have put the names in all caps,

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they could have put it all in lowercase,

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we don't want all of that ambiguity.

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So we're going to check the names against lowercase letters.

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So we're also going to use the ".lower() method"

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to make our combined names into lowercase.

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That means we take our name1, name2, for example

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in the Input, we've got David Beckham, and Victoria Beckham.

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By combining it on line five, we now have

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a single variable called davidbeckhamvictoriabeckham

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and by making it lowercase,

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all of those letters are now lowercase letters.

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The next step is to calculate the first digit

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in the love score,

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which according to the rules is to check how many times

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the letter T-R-U-E occurs in both the names.

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So we're going to check it against our lower names,

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the combined lowercase names, and we're checking it

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against lowercase letters as well, t-r-u-e.

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And then, we use the "count() method" to see how many times

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that letter occurs in our combined name.

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And we add those numbers all up together in order

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to get hold of our first_digit for our love calculator.

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And similarly, we do the same thing for the second_digit.

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We count how many times the letters l-o-v-e occurs

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in the combined lowercase names, and we add all

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of those occurrences up to get our second_digit.

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Once we've got both digits,

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then we can combine them together.

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The way that this calculator works is we take

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the first_digit and the second_digit

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and we create a two-digit number.

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So we can't just add it together like maths.

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It's not like 9 + 8 equals 17,

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it's actually 9 + 8 equals 98.

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So that means, we're going to have to turn our digits,

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which are numbers into strings

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so that we combine them rather than add them up.

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To do this, we write the str() method, we wrap it

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around the digit that we want to turn into a string

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and then we use the plus sign (+)

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in order to concatenate it together

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so that they occur one after the other as if it was text.

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Now, the final step is to check the score

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against the conditions that we set out

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in the description, so we can give people an interpretation

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of their score. Because in this case,

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we're going to have to compare numbers against numbers,

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then it makes sense to turn our combined love score

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into an integer, so we wrap that combined string

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into an int() method to turn it

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into a number that we can compare against other numbers.

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All that's left to do is just to write

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an if, elif, else statement

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in order to check against the three conditions.

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If the score is less than 10 or if it's greater than 90,

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then we print the first statement.

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Otherwise, if the score is greater than

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or equal to 40 and it's less than or equal to 50,

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so between 40 and 50, then we print the second statement.

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And if all of those are not true, then else, we

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just print out their score in the third statement.

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That's all there is to this exercise.

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If you had any issues, then go back

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to the previous slide and see

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if you can fix your code to make it pass all the tests.