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Welcome back in the previous lesson,

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we successfully learned how to generate a random letter

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by making use of the random module. And also the random dot choice method

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a question I have here is, well, what if we wanted to generate multiple letters?

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And not just one,

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what we have to do is to, first of all, change the method from random dot choice

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to random dot choices

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because now it's plural, we're dealing with more than one letter.

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Another thing about random dot choices as a method of function

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is that it's going to accept two parameters instead of one.

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The first will be

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what we call the population,

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which is basically where we're pulling the letters from.

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And then the second

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is going to be the actual number

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of letters we want to generate.

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So in this case, right now, I'm going to say K equals three.

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All right. And now I can change the print text from

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letter to letters and then change it to R.

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Now, if I run the program, we have K RJ, I can run it again. We have QMW. Right.

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So you can keep that in mind.

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However,

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we want to move a step further to generate a random password.

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So we're no longer just dealing with letters.

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We're now going to combine letters with uppercase and numbers and so on.

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And I'm pretty sure you've seen random password generators before.

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Maybe it's on the websites where you are asked to create an account.

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You want to create an account and then they offer to generate a password for you,

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which you can then change later.

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I'm gonna show you how we can create our random password generator.

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And we're just gonna use five lines to do

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this.

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In fact, four lines, just four lines. OK? You don't believe me, take a look at this.

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So first of all,

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we're going to keep the import random because obviously

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we want to randomize the letters and numbers.

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But we're gonna import

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a library here called string

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because we're gonna be manipulating our strings which will include letters,

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numbers and so on.

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So we have import string

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and now I'm going to create a variable that will represent the password.

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I'm gonna call it password

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equals.

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And I remember from the previous lesson, I'm gonna say random.

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OK

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dot Choi says,

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because now we're going to be dealing with multiple letters

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and now in brackets, remember the first parameter for this function or method

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is going to be the population.

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We have to tell the function where to pull the string from the letters from.

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The thing about the string

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library

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is that let me just show you

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over here the string module. But

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we have a variety of methods or in this case, we call them constants.

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So we can say string

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key underscore letters, this will pull in letters

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that are both capital, lower case.

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And then we can specify, we can say string

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key, lower case, this will pull in only lower case letters.

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And then we have for upper case, we have for digits,

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digits, punctuation

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and so on. So we have all these methods, all this constant that we can work with

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when importing the string module. So

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let me drag this one away.

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What we're gonna do right now is for the random choices, we want to pull

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string

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dot

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as

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key

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and now underscore letters,

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ok? We're gonna pull random

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letters.

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And then in addition, plus

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we also want to pull in what digits

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we want to have numbers

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in our password as well.

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So basically we're telling the function we're telling Python that hey,

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for the choices of letters

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for the password, we're gonna pull in letters that are both uppercase and lowercase

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and then also digits as well.

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And then of course,

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the second parameter we need to specify how many

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letters digits are going to be in our password.

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So I'm gonna say K

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equals and let's go with 10.

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Ok? So a pretty strong password

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and now all we have to do is what just print,

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we're gonna print

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and I'm gonna say uh

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generated

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so generated password.

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Ok.

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And then

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let me add my comma and then password,

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that's it.

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We're going to generate a password

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and now let's try it. Ok. So I'm going to go ahead right now, run the program

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and there you go.

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We have capital K,

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we have six, we have capital F, we have 60, small letter

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H, capital J zero, capital W and then capital R.

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So you can see right now, it successfully created

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it passed with 10 characters. We had upper case letters, lower case letters

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and a few numbers as well.

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But

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what if, what if instead

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of having the characters separated by a comma and codes,

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we want to join everything together.

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So we have just one single string.

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How are we going to do this?

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We will have to make use of a special function called

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the join

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function.

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It's actually a method.

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So

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what we want to do right now is

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over here where it says random

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choices.

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We're going to add this very special

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function

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called join and it goes like this,

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we're gonna have

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a single codes and then dots

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join. And now we'll have to open up a bracket to

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cover everything in here

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and there it is.

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So what this is going to do is that it's going to generate the password,

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but then all the characters will be joined together.

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Now, if I run the program one more time,

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there you go.

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Now we have it looking much better. I can run it again

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and there you go,

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run it one more time

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and there you go.

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So it's kind of amazing how with just four lines of code,

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we've been able to create our very own

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random password generator.

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We of course had to make use of two

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standard modules, the

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random module and then the string module and of course

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two additional lines of code

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and there it is.

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So that's it. Thank you for watching the video. I will see you in the next class.