[MUSIC]

I thought what we would do this week, we've done it before and

people seemed to like it, I wanna do it again.

Is just to build some learning code,

just kind of playing around with some code.

So I've got this one which is beginner python exercises.

I've got Karen's list of projects, which is basically any language you want.

And then there's also this site called CodeFights,

I don't know how many of you have seen CodeFights or not.

But it's pretty cool, they give you a challenge and

you have to go write the code for it in whatever language you want.

And then they tell you how well you're doing or not, which is cool.

So I'll leave that up to chat,

to pick like kind of which one of those they want for a minute or so.

If nobody comes in then I'll just pick one, and we'll do stuff.

But we'll talk about the code that we're gonna write.

We'll talk about just other Python things or

just programming things or whatever,

we'll talk about whatever you all want.

One thing that's really fun is today is my three year anniversary for

Treehouse, so that's kinda cool, I started three years ago today.

And also today is Andrew Chalkley's birthday, so

if you are a fan of Andrew wish him a happy birthday.

Mohammad, you want some PHP?

I'm trying to get Alina to do it,

there's a good chance I'm gonna get her to do it, probably next month.

Because I'm gonna be out for a week or two due to conferences.

So I'll try to get her to do it.

But PHP is a fun language, it's got some cool stuff.

I, unfortunately, haven't done it in a long time.

So I don't feel like it would be a great idea to have me doing PHP,

probably be a bad idea.

All right so, Let's

just try some practice projects over here.

Let's just see what we can find, that sounds fun.

So this one we have kind of a little

guide here showing, I guess, how hard this is.

These are all supposed to be basic beginner programs or

challenges, not super hard stuff.

And then Karen's Projects here, these are really, really spread out.

So we've got graphics stuff.

We've got threading stuff.

We got whatever.

So yeah, any of these that y'all would like to see?

Or we'll do some CodeFights.

This one's codefights.com.

This is github and this is practicepython.org.

Okay cool, so let's try one of these harder ones here,

just to see how hard the hard ones are.

Let's start off with a three.

Let's see. Let's try out the Reverse Word Order.

Okay, so write a program using functions

that ask the user for a long string containing multiple words.

Print back to the user the same string except with the words in backwards order.

So if we type in my name is Michelle, we get back Michelle is name my.

Okay, that's not too difficult of a thing, right?

So let's try this.

So we'll say, reverse_words.pi.

This actually sounds like something I would make all of you do as a code

challenge.

[LAUGH] So there should be many of you that could tell me how to do this one.

I'm gonna try and get these to where I can kind of see both things.

So let's say, reverse_words(string).

So the first thing we wanna do, we're taking in a bunch of strings,

or we're taking a string with a bunch of words in it,

we probably want to break it up, right?

So let's do words = string.split.

And that will break it up on the white space.

So, tabs, spaces, new lines, all kinds of stuff like that.

All right, and then we want to reverse that.

So, let's return, Space separated,

.join words in reverse order, that should do it.

So we'll say input("Give me a sentence: ").

And then we need to assign that to a variable.

Sentence.

And then let's say print(reverse_words(sentence)).

All right, so is there anything in here

that y'all find confusing or strange?

If there's something in these six lines,

that you're confused about, let me know, ask questions in chat.

But let's go ahead and run this, and we've got down here Give me a sentence, so

Hello to everyone in the live stream chat.

And we get back chat stream live the in everyone to Hello, so cool it worked.

Nice.

Let's actually go a step further.

Let's make it reverse the letters in the words and reverse the words.

So instead of, we'll effectively print the entire string backwards,

which that should be different.

Let me check to make sure this isn't gonna just do what I think it is.

We'll just print that.

All right, so say Hello to everyone in the live stream chat.

Yeah that would just do, okay so let's reverse the letters,

leave the words in order.

I'm going to change this too, so

reverse_word_order, Cuz that's the name that makes more sense.

Can I share the links?

I will do my best.

Chat is often weird about this for YouTube and stuff.

So let's see what we can do.

Let's try that and let's try this.

And lastly, I'll pop in this one.

Hey DarkDev, how are you doing?

All right, so yeah, we've got the reversing word or we print the words out

in the reverse order that they were put into the sentence.

Now let's print out the words in the order they were in the sentence but

each word reversed.

Not really harder to do but,

But still, it's a neat thing to do, it's fun.

So we wanna do words =

string.split, again, because we wanna break it up into a bunch of words, right?

And then I'm gonna do this as a list comp, so

let's return, space separated, .join.

And then word -1 through word in words.

Okay, so now, This

will be reverse_letter_order.

All right, and let's try this one again, so

we'll say again Hello to everyone in the live stream chat.

Sweet, so now you can see we've got the words in reverse order, but

then we have the words in the correct order but printed out backwards, right?

Abdul, I posted the links in the chat a minute or so ago.

And dimar, Python is completely free, yes,

you can go to python.org and download it, and enjoy.

All right cool. So

I think we've definitely solved that challenge, right?

That's not too bad.

Now these are definitely beginner challenges.

These are not ones that are like, you're going to spend a month

solving one of these things, so So that's cool.

What's the colon colon?

So Stern, you're talking about these two characters right here, right?

So that's a fun thing in Python.

In Python we have a thing called a slice, so

let me hop into the Python console here.

Okay, so I'm gonna make a string, all right?

So I'm gonna call this name and it's gonna be student, all right?

So if I want to get just one character out of there, I can use brackets,

the bracket notation and the index number of the letter, right?

So in this case I got s because s is

the zeroth index is the first thing in the string.

So if I want to get a couple of things out of here, then I can do the same thing.

Let's actually do the next one.

And then I can list the next one that I wanna get.

So I wanna get from one up to three, all right.

So if I do that I get T and E cuz this is one, this is two, and

we don't get three, we get up to three.

Hector, the link is in chat, just a little ways above you.

It's called code fights, codefights.com.

All right, so Stewn and everyone else who's wondering about the double colons.

So, that's how I get a sub string or a sub list of things, okay?

I can also do, like, let's say five I don't think that's quite right.

I can also list a step.

Okay, so that's t and u, so it got one,

two, three, four, it would have gotten five but it couldn't find it.

But it only took every other one.

So it did a step of one, and then a step of two took the next one, and

then stops, okay?

I can leave off anyone of those that I want and it will get,

if I leave up the first one I'll start at the very beginning.

If I leave out the last one, it goes to the very end.

If I leave off both of them and put in a step,

then I will get every other item, or every third item, or whatever.

I can put in negative steps though, and it will reverse, it will go backwards.

So it goes, in this case from the very back to the very front, and

in this case takes everyone, in this case we take every other one.

In this case we'll take every third one, that kind of thing.

So, that's what we're doing here is we're taking the entire list of words and

reversing that entire list.

Or in this case we're taking all the characters,

all the letters in the word, and reversing those.

So, yeah, that's what we're doing.

Thanks for asking me about that.

Darkdev, I am doing the lutem dare.

Yeah, my friend Owen and I are gonna do it.

[LAUGH] We're gonna use the language Rust,

and we're gonna use the GGEasy library.

So, we'll see how it goes.

I don't know that will go well, but we'll see how it goes.

We're not too worried about actually having something submitted.

We really only worried about building something and playing around with it.

So, if we get something built, that's cool.

If we get something submitted, that's amazing.

But if we don't, that's okay.

All right, Shamul, you wanna know about Tuples.

Okay, what do you wanna know about them?

Ask me questions about them and I will happily answer them.

While you're asking those, I am going to start the next one of these.

So I'm gonna call this passwords.pi so I'm gonna try this password generator.

And we're gonna see how we go here.

Okay, a couple of questions first.

Cigar asks, when should we stop with a particular programming language and

move forward to some other language?

Python is my first language.

You don't have to.

You never have to move on.

This isn't completely universal, the statement isn't completely true.

But every programming language is capable, right?

You can pretty much do anything you wanna do in pretty much any language, right.

You might have a really hard time making a high performance video game in PHP or

in I don't know, Manalua actually good for video games.

Anyway, right.

Some languages are better for some things than others.

If you're building desktop applications, Python's not particularly great,

it's okay, but it's not amazing.

So you don't ever have to move on so long as the work you're doing

works really well in the language that you like to use.

So just stick with it.

But it never hurts to know a couple of languages.

So that said, learn some other languages.

Marion asks, is migrating from PHP to Python difficult?

Yes and no?

I basically made that migration.

Python is a lot more strict about how you do certain things and

there's a lot less typing in Python than there is in PHP, like actual typing out

letters for a lot of things, not everything, but for a lot of things.

So some of those things are a little difficult, right?

Like having to obey those rules can be really hard for

some people when they go from PHP to Python, or any language to Python.

Python's very, you need to do these things in this way.

But it's not as hard as other languages, like say, Rust or Haskell, or whatever.

Anyway, so the migration's not the easiest thing but it's not super hard.

So Muhammad you want to know where it can be helpful, where what can be helpful?

I'm gonna scroll up a bit through the chat and see if I see.

Yeah, you said you want to know where that.

I want to know that where it can be helpful.

Can you tell me what the thing is that you wanna know where it's helpful?

And then Dimer has asked, PHP or C#, is it better?

It's really gonna depend on what you're doing.

Yeah, just depends on what you're doing.

Ryan, what are classes in Python, can I show an example?

I sure can.

And DarkDev, as far as the theme, you don't have to follow the theme.

The theme is just there to prevent the empty page syndrome.

I'm sure you've all experienced this, right?

You have to write a story for class or something or you have to write a program,

or you have to do whatever and you're presented with this page right here and

you are just like I don't know what to put into that page, right.

That can be really challenging.

So to prevent that the lutem dare people made it to where they gave you a theme.

And you can follow the theme if you want, you don't have to follow the theme but

the theme helps you to prevent that empty page thing because

okay I gotta build something that has to do with forest, okay great.

Okay, so, now if I do the question about python we've heard Ryan

wants to know about classes.

I bet we can use a class for this password generator.

And Shmuel doesn't understand the difference between dictionaries,

and tuples.

Okay, so we might be able to use both of those too.

So let's see what the problem is first.

Write a password generator in Python.

Be creative with how you generate passwords.

Strong passwords have a mix of lowercase letters, uppercase letters, number and

symbols.

The passwords should be random,

generating a new password every time the user asks for a new password.

Include your run-time code in a main method.

That should be function not method.

Extra, ask the user how strong they want their password to be.

For weak passwords pick a word or two from a list.

All right, cool.

So, lets do this.

Lets import string and let's also import random.

So, Python provides us with a lot of libraries, right?

And two of those libraries random and string are really useful, because they

contain modules that we can use to build other things or methods we can use rather.

Random let's us do random things.

Strings has a lot of stuff about like ASCII characters.

So, let's do password generator.

All right, so this is a class, guess what?

That's a class, that's it.

So, there's a class.

I've made a class.

But I probably need a bit more information about this, right?

So, let's have

a thing here where we do, let's say

strength, and we'll start with 16.

Okay, so self.strength = min().

How do I wanna do this?

I don't want them to be anything lower than 16.

Max, that's what I want, so 16 or strength, okay?

So this way, they have to give me something that is at least 16, right?

If they give us something above that, then that's cool, we'll use whatever that is.

If they don't give us something above that, we're gonna at least use strength.

And then, we want to do

self.password =

self.generatepassword.

We don't even need to get a pass on the strength,

that's gonna be stored on the instance.

And that's it, and then, we'll do def __str__ return self.password.

All right, so we have a class right now, and

its initialization method has an argument that comes in called strength,

which is always at least 16 due to this.

And then, we're gonna call this method called generate password,

which I haven't written yet.

And if we turn our PasswordGenerator instance into a string, it's gonna return

self.password whatever the string is that we've generated for the password.

So let's talk about how we generate this password.

Okay, so that has to take self because all instance methods take

the instance as the first argument, typically, that's called self.

All right, so I'm gonna use the strength to be how long the password is, okay?

So let's look at string,

where is string?

String, string, string, string, string, string, string.

It's down here somewhere, there it is, the module string.

All right, so you can see here, we have, very handy.

We have printable, we have digits,

we have ascii_letters, okay?

So we want those three things,

so let's just say, pool =

string.ascii_letters + string.

It wasn't not numbers?

digits + string.punctuation, okay, so

that's our pool of characters, right?

So we take our letters, our digits,

our punctuation and we're gonna cram those altogether into one big string.

And then, I wanna pull random things out of there.

So let's go look at the random module.

There's random, random has a really handy,

to me at least, function in it that is known as choices.

Cuz I don't necessary want shuffle, we'll look at shuffle later.

I don't necessarily want sample because sample is always unique, and

we do maybe want things to repeat.

So we're gonna use choices,

choices is going to pull out random choices up to a number that we specify.

So let's just do password

= random.choices(pool,

k=self.strength).

So that's going to pull out a random number of choices based on the strength

that we've passed in.

So we're basically making a string that is 16 or 32, or whatever characters long.

Then, I wanna take this a step further and I want to shuffle it, all right?

And so that will randomly shuffle them around, so cool?

So we do random.shuffle(password), so

it will randomly shuffle all those things around that it randomly picked out.

And then, is there anything else that I wanna do?

I don't think there is, to shuffle an immutable sequence and

return a new shuffled list,

We'll have to see what this does, I have a feeling this may error out.

Okay, so I think we're good enough for now, and

then, we're gonna do a return password.

So down here, let's do

a if __name__ == '__main__':

print(PasswordGenerator(input).("How strong

should your password be?") ) ).

All right, that's good enough for that, okay, so we're gonna run this.

How long should your password be?

Let's test this, I want something that's 10 characters long.

This should automatically give me back 16, right?

I should always get 16, I should never get anything below that.

That's right,

let's do this,

strength = d2ti,

there we go,

okay, so try

while True while strength

Yeah, that's what I want.

Isnumeric I'm not a big fan of this right here,

but it'll work for now.

else:

print(PasswordGenerator(int(strength))), all right,

let's try that one.

Should be 10, returned non-string list type.

There we go, all right, and let's see, 1, 2, 3, 4, 5, 6, 7, 8,

9, 10, 11, 12, 13, 14, 15, 16, 16, sweet.

So I got a password that is at least 16 characters long,

and it's a randomly generated password.

So that's cool, let's try this with something longer.

Let's try 32 as a much longer password.

So neat, so it gave me a random password, these would be fairly safe to use.

Hopefully, [LAUGH] no websites would reject it if you use those,

but yeah, so there's the password.

So here's an example using random, using string, and using a class.

I wanna look back through chat cuz I know I've seen some other questions come in.

And blah, blah, blah, blah, blah, okay, dictionary and

tuples, tuples, we'll go play with in a second, Shimul.

DarkDev, we're not gonna talk about the theme, we're not gonna worry about that.

David wants to know if I can program in Java, no?

I can read it, and I get a pretty good idea of what's going on in it.

I've been taking some of our Java content at Treehouse lately.

So push came to shove,

I could probably write just a little bit of Java, but no, Java's not my language.

It's a neat language, it's got some cool features.

But it's not one that I have any real confidence in myself in just yet.

Abdu says, they've just finished their first language, Python.

Congratulations on finishing a whole language.

And I wanna learn a framework to make a web application,

should I learn Bottle, Django, or Flask.

I would say, you probably wanna learn Django simply because it has all the bells

and whistles and bits and pieces that you typically need for

building a web application.

Bottle and Flask are gonna require you to bring those in yourself

Sometimes that's great, sometimes that's not.

So I think at the first step, you kinda wanna just have everything there with you

and you know that it's all gonna work.

Sagara asked, what is Python used the most for in companies?

It's used for a lot of things.

Facebook uses it for URL routing and service routing.

Instagram uses it for a good chunk of there stack or used to,

I'm pretty sure they still do.

YouTube uses it for a good chunk of their stack,

again used to pretty sure they still do.

It's used for data science a lot, so calculating where customers

are abandoning shopping carts, and all that kind of stuff.

It's used for a lot of things.

Nikos, this, This right here is

an application called Zeal, Z-E-A-L, and it is an offline documentation viewer.

If you're on Mac, there's one just like this that's really handy called Dash.

So yeah, check those out.

Chad, glad I could help you with OOP.

Blah, blah, blah, blah, [SOUND].

Sagara, if name equals main takes advantage of Python's name spaces.

So name here is the current namespace.

If I'm inside of a class or whatever, that class is now that namespace.

So in here this says, if the script is being run directly, then do this stuff.

If it's being imported somewhere else, don't do that.

Humanoid, how is Windows going?

Windows is fine.

I had kind of an annoying thing earlier, trying to get SDL set up on Windows,

but it turns out I was just doing it wrong.

It wasn't actually Windows fault, it was my fault for

not realizing I didn't have certain things installed and put in the right place.

So once I got those fixed, it all worked fine.

We'll take a look at some rust later, you all.

I'll do my best to explain a little bit of it, and we'll look at it.

Martin, what languages do I mainly know?

Full web like HTML, CSS, JavaScript, Python.

I can read and sorta kind of write, cuz I'm super rusty PHP.

I got a bit of Java, I got a bit of Rust,

I got a bit of Lua, I got bit of kind of whatever.

And Marion, yeah, Python's very friendly to machine learning.

So okay, cool.

I think we got that one.

I don't know that there's anything else here I wanna cover,

except maybe we'll do the birthday dictionaries here.

Just to help the person that was asking about

understanding tuples and dictionaries.

Humanoid, do I want a code fight?

Not at the moment, but maybe in a bit.

So let's get down here and let's do birth.

Birthdays.py, so the difference between tuples, which looks like this.

And dictionaries, which look like this.

Let's start by creating our birthdays here.

And we're gonna put in the birthdays of people's names, or

we're gonna have keys of people's names.

These are gonna be our birthdays.

So it looks like we're gonna have these three people.

So let's just, Paste those in there.

And the cool thing about dictionaries is,

you can have your keys as strings, right?

They can also be integers and they can also be tuples.

They can be anything that is non-mutable, that's immutable, so

it mean they can't be change.

Which means that you can do a lot of nice things with them

So let's pull out, let's actually find these people's birthdays.

So Albert Einstein, which I realized I just completely misspelled his name,

but Wikipedia's smart enough, they will find it for me.

Thanks Wikipedia for being smart.

So I'm actually gonna do these as dates.

So let's do datetime.date, and the year for this is 1879.

The month for that would be 3, and the day for that would be 14.

If I remember correctly, Python's date time does not zero index,

months, or days, unlike some people, JavaScript.

[LAUGH] So all right, let's also get Benjamin Franklin.

All right, so he was born 1706, 1, and 17.

And then lady Lovelace,

when were you born?

[LAUGH] Not Amazon, wow.

Lovelace, I'll see you around DarkDev, have a good day.

And yeah, Humanoid, [INAUDIBLE] are pretty much the best thing ever.

Okay, so Lady Lovelace was born

1815, 12, 10, cool.

So let's go back to this prompt.

So what where supposed to do is print out, I've got a bunch of birthdays.

Abdu, should you be a professional in Python to learn Jango?

No, you can learn Jango before you're a professional.

I don't know if there really is a, yeah, there's no requirement.

So just learn stuff when you wanna learn stuff.

Okay, so let's print, welcome to the birthday dictionary.

We know the birthdays of, and

then here we're going to do, for name in birthdays, print name.

So when you loop over a dictionary, when you do a for

loop on a dictionary, what you're actually looping over is the keys.

Because the keys are the primary part of a dictionary, they're the part that's the,

not to say most useful, but they're the most static part of a dictionary.

They're the part that Python does its best to store right upfront somewhere nice, and

handy easy to get to.

So when you loop over it, that's what you get.

So in this case we're gonna print out the names, and

then we're supposed to do an input here.

Let's do name equals.

And then inside here, whose birthday do you want to look up?

And then let's say, they're gonna do that name.

And then, we'll do print birthdays name, okay?

So let's go ahead and run this,

and I wanna look up Ada Lovelace's birthday.

And let's do a .trim on that.

Does trim not exist?

No, it's strip.

What am I doing?

All right, so that should print out that.

But I have a feeling that this is going to look a little weird.

So yeah, so that's not necessarily the format that I'm used to, right?

That's not necessarily the way I wanna read it.

So I'm an American, so I typically want to do month, day, year, which is weird.

But let's go ahead and do it that way.

STRF time, we wanna format this.

And how do we want to do this?

Let's go down here and

look at the list.

So I want the month first, so let's actually do this as the month's full name.

So %B, that's not a percent.

That's not a percent either.

Percent, capital B, and then the day of the month is %d.

And then the year is %y.

All right, let's try this again.

Ada Lovelace, December 10, 1815.

So cool, that's nice.

That's neat.

All right, so that's pretty simple.

I think we've pretty much exhausted these.

These basic challenges.

So we're gonna try something a little harder.

Humanoid, what music do I listen to?

The music in the stream is Chris Zabriskie,

he is a Treehouse employee and he makes pretty awesome music.

As for me personally, It's somewhat of a interesting mix maybe.

There's a lot of like, 90s, early 2000s

punk hard core, and rock.

And then like 1950s and 60s country, and

then just other random stuff as it comes up.

Zeeshon, what do I think of TensorFlow?

I haven't gotten to play with it.

But it seems pretty cool.

So I don't, I don't have any problems with it.

I think it's cool, but I haven't gotten too far through it.

Peter, this is not a django project.

We are just doing some different code challenges, and

we're just talking about programming.

So, today's kinda more of a chill

relaxed stream than before.

Abdou, can I explain super function?

Sure, I can explain super.

So, let's pretend that we have, Yeah, let's just do this.

Let's do a,

BadPasswordGenerator.

And this inherits from PasswordGenerator, okay?

So right now this class is fine, and this class just does all it's own stuff, right?

So, well not all of it's own stuff, sorry.

It does whatever PasswordGenerator does.

But I want to override some of this.

So I'm gonna take self, and I'm gonna take any args and kwargs that come in.

But I don't care about them, right?

What I'm gonna do is I'm gonna do super().__init__.

And strength is gonna be equal to,

Actually I'm not gonna pass anything in, okay?

So now we have the same password as we had before, okay?

But I'm ignoring any kwargs that come in,

I'm not listening to you on whatever you're gonna feed me.

You can say, I want this to be 82 characters.

I don't care, I'm ignoring that and I'm calling super and

I'm just letting it do whatever.

So then I'm gonna say self.strength

= 8 and self.password

= self.generate_password, okay?

So now down here instead of thatm let's do BadPasswordGenerator.

We're gonna run this, I want it to be 32 characters long,

no matter what I get an 8 one.

So the super calls the same function, or

same method usually, from the parent class.

So in this case, this calls init from here, it causes this init to be run.

And then we could go on and do whatever we want.

So super just goes to the super class and runs that method,

or runs the method that you specify.

All right there's no music in the stream, there should be.

It's just very, very quiet right now.

So, I don't know.

All right, let's try one of these code fights.

I'm not sure how the code fight goes against somebody.

Humanoid, if you want to tell me how to do that one.

But let's just try whatever the day's challenge is.

So what do we have?

We have algorithmic and we have database.

All right, let's just set for, I don't wanna deal with database stuff.

I don't know what I really wanna do.

Too many of these.

The longestConsecutive one's kinda neat but I don't wanna deal with binary stuff.

Let's look at the strings one.

Given an array of equal length strings, check if it's possible to rearrange

the strings in such a way that after the rearrangement

the strings at consecutive positions would differ by exactly one character.

For InputArray, "aba", "bbb", "bab", the output should be false.

Okay, for InputArray "ab", "bb", "aa", the output should be true.

Because the strings can be rearranged in the following way, "aa", "ab", "bb".

Okay, that, Seems all right.

So we get back a whole bunch of strings.

What's the, I'm just gonna look up distance.

I don't think that's gonna give me what I want, but

it's like the Levenshtein distance or something like that.

Yeah, that not gonna get me what I want.

Levenstein, I know I misspell that but Dr.

Google know what I want, yeah.

Okay, so there's a package that does it, that's cool.

I don't really want a package cuz I can't install one.

I just want the actual thing.

You did it in C, you didn't even do it in python.

Wait just a second and let me look at the package.

So we have that external package, yeah.

We don't have any entry points, okay.

So if I remember correctly this is the thing that we want.

Okay, we want the Levenshtein-Distance of two strings.

All right, so let's try building this real quick first, and

then we'll see what we can get here.

Option that's it, there we go, how do you spell that, S-H.

Levenshtein.py, all right.

So this is Python 2.

We're gonna have to change this so that it's Python 3.

But, that's okay.

Okay, so we don't wanna print.

We don't wanna print like that and we don't wanna print like that.

And this should be input and input.

And that should be like that.

Okay, so let's try this out.

So if I do aa and ab,

'range' object does not support item assignment.

That's true.

It doesn't.

Where did we try to do item assignment?

Class range does not define that, okay.

So matrix, at this point, This is

why you don't use really bad little variable names, kids.

Okay, I'm not even gonna worry about that.

So we get the length of each of the two strings, okay?

And then we do range, length of the first 1 + 1.

Okay, * link to the second one + 1.

And then for each thing that's in range,

link of the second one + 1, we do matrix,

whatever that thing is = range.

Where we're at plus the length of the first 1 + 1.

Okay, so then for zz and range length of the second one,

for sz and range length of the first one,

if, Okay, if the first string plus the place

that we're on is equal to the second string plus the place that where at,

Then matrix[zz +1], I see.

I need to turn this into a list.

Okay, so we're doing the min out of each of those, and

then down here, we need the same thing.

So that equals this list here.

And this list here, And this list here.

Okay, let's try this one again, aa,

ab, and our distance is four, okay.

So what about aa, bb?

Our distance is four.

Maybe, this isn't gonna do what I want it to do.

[LAUGH] What was that other example that they had?

aba and bbb,

Yeah, cuz that's got more than one character.

So that's six, so maybe, if the distance

Okay, so aa and bb, that was also a four.

All right, so somebody asked if the C programming language

able to create an online game like an MMORPG or

edit someone else's online game, could you create an MMORPG?

Yes.

Could you edit someone else's MMORPG?

Probably not.

Okay, Humanoid, I'm gonna not worry about this one.

How do I see the challenge?

This one, I'm guessing.

Okay, get ready.

You assume I know what I'm doing, CodeFights, Look at all your stars, man.

You got four stars.

All right, now I'm not promising anything,

I'm not promising I'm gonna do better than you.

I'm not promising I'm gonna do worse than you, either.

Okay, given an array of integers, find the pair of adjacent integers

based on elements that has the largest product and return that product.

So, for input array 3, 6, -2, -5, 7, 3, the output should be 21.

7 and 3 produce the largest product, okay?

Okay.

So let's start that.

Come on, you all, this is not how you format code.

Okay so,

[MUSIC]

First equals that and that.

[MUSIC]

Was this your code?

Or is this.

No, this is just some code that they gave.

Okay.

Best equals none.

Yeah, best equals none for x, y and z.

Input array.

Input array.

1: if X times Y

greater than thest.

Actually, if best is none or,

So Y equals that, best equals X times Y.

Return Best.

Expected output got 18, expected 21.

You think I can only change one line?

Let me reset the code.

Okay so they're doing best= InputArray[0] * InputArray[1], cur = best.

For I in range (1 to the len(InputArray)-1).

Cur= InputArray[i] * InputArray[i + 1].

If best < cur, cur = best.

Return best, and running that one, Fails, it fails all of the tests, right?

Two out of eight.

See, I don't like the way they're doing this.

Okay, I'm probably not gonna beat you, as I'm having to code on the spot on camera.

So, [LAUGH], okay.

Yeah, this is a silly way of doing it like this is fine, right?

Like that's fine whatever, do that.

But for XY in zip,

input array input array

1:, Right?

Because that way you're never comparing two numbers to themselves.

So, cur is equal to x times y, if this is less than that, okay.

Run your sample tests.

Number of lines changed in the sample code.

I'm gonna look over here at the rules.

There's one bug.

I'm just looking for a bug, I didn't know I was just looking for a bug.

All right, best is equal to that times that.

I wanna arrange that,

This should be best equals cur.

Yeah.

No, Humanoid it is cool, it's not what I was expecting, right?

So, yeah.

[LAUGHING] All right, now I get it.

Now I see the rules.

Okay, cool.

[LAUGHING] Let's go over the next one.

Okay.

Given an array of integers, find a product of its elements.,

So I've got an array full of numbers, get back to the total products.

Rules on this one.

Recovery task.

The highlighted area of the code is missing, understand and recover it.

Note that multiple lines of code might be missing.

Okay, so I'm gonna get an array, and

then I need to return the total product of that array.

Okay?

Should be easy enough.

Can I start?

Do I just wait for the timer to run out?

I guess I got to wait for the time to run out.

All right, let's see what's going on in chat.

And if anybody else wants to challenge me I'll probably have time to do another one

after this, so feel free to go sign up on Code Fights and fight me on something.

We have 17-year-old from Egypt.

That's cool.

How you doing?

You've got seals in Visual Basic.

That's a good starting language.

And Peter, or Petter?

Tell me which one of those it is.

I'm glad that you're enjoying the series.

That's cool.

All right, so let's start.

What is up, why can't I?

I'm gonna refresh.

And now watch I'm gonna have to do the first fight again.

[BLANK_AUD [SOUND] Look what you've done, Humanoid.

Look at this.

Now we're all just watching a spinner.

Humanoid [LAUGH].

No, it's not your fault at all, it's CodeFights being weird, I guess.

Privacy Badger, yeah, you can block user voice, I don't care about user voice.

I have no code friends online, no.

Okay, so it's figured out that we're on Round 2.

All right, cool, hey, there we go.

Okay,

Seriously?

No, I know what this is supposed to be, this is supposed to be InputArray[0].

Yeah, CodeFights is really slow, double t the segment, so it's Petter and not Peter.

Okay, well Petter, I'm happy to have you here.

What can you learn when you're 17 years old?

You can learn anything you want.

I mean, yeah go learn Python, go learn PHP, go learn JavaScript,

go learn C#, learn whatever.

How are ya'll doing?

[LAUGH] I guess we're gonna just wait here.

Can I list the extension that I'm using in chrome, which one?

I have a lot of extensions in chrome.

If you can tell me which one you want to know.

Yeah, you're not a beginner, you've been doing VB for years.

So yeah, go build pretty much anything you want, right?

Use VB to build apps or whatever.

Sweet, so I passed that one.

All right, let's go to the next one.

All right,

the algorithm should return the smallest non-negative integer of N digit's length.

So, if we want an integer that is three digits long,

then we return the smallest one that is at least that.

Okay, I don't care about solutions.

CodeWriting, so I'm just writing straight code in this one.

Okay, Let's start coding,

all right, so what do we want here?

We want length =

length = n?

I don't even need that, okay.

So what I want is the smallest number,

so let's see, base =,

10 to the power of n.

That's not right, cuz if I do that and

I get 10 to the power of 1, I get 10.

And I don't want 1, All right, let's just do this.

Return min, (map[int.

Filter [lambda x len(x) == n])),

I'm going to break this up a little bit.

Because y'all won't ever be able to read this,

and I won't remember what I was doing [LAUGH].

Okay, Okay,

so lamba [SOUND] and map(str,

[MUSIC]

Hold on I'm not thinking this through at all.

[MUSIC]

I'm thinking it's gonna feed me numbers, okay.

If n == 1, return 1, else: return 10 to the power of n.

[MUSIC]

My favorite Chrome extension.

[LAUGH] My favorite one is probably privacy badger, or

uBlock Origin, because it keeps me from having to see annoying things.

Also HTTPS everywhere, those are great, I use those a lot.

Peter you are just catching up that cool, yeah,

we've been doing this about six months now so there is quite a bit to watch,

hopefully Hopefully you will like all the stuff that you watch.

Zander any good sites to practice Lua?

So I don't know anything for practicing Lua specifically, but

there is this getup.com/karen/projects.

These are language agnostic challenges So

you can go and do them in any language that you wanna do.

So Java, LUA, Python, PHP,

whatever cuz you're just doing them on your own computer.

So you can kinda do whatever it is you wanna do but

it's a really good test there.

That should be n- 1.

All right, how did we do?

You beat me.

Well, good for you.

Good job.

Yeah, that was, those were good challenges.

Like I said, you're probably gonna beat me because I'm doing this live on camera.

And I didn't know what the challenges were of course.

So, but that's cool.

Code Fights is a really neat thing, I I need to play with it more and

I need to do more coding on this.

I am wondering if some of this time should be stripped because of just how

freakishly long it took to submit those things, right like

Though some of those things took like minutes to submit.

Maybe that's because I'm streaming, that could very much be part of it because I'm

pushing out, you know, video to everybody.

But, yeah that's pretty hard core.

But yeah great job Humanoid.

So Everybody give Humanoid some congratulations, some thumbs up.

So, Sca Kraft, cuz I can't pronounce your Arabic name there, sorry.

You said you want to make 3D games.

You're probably gonna wanna learn something other than VB To make 3D games.

Those two words sound a lot alike.

Java is an okay choice, but you're probably best off really with c++ or c#.

If you do c++ then you can build stuff with Unreal Engine,

c# you can build stuff with You can build stuff with Unity.

Those are probably your best two choices for

doing 3-D things.

All right.

Do you all want to look at rust?

You want me to show you.

some rust that I've done,

by playing totally from tutorials, totally from other stuff.

But, I can show you some rust, because rust is kind of cool.

It's neat.

Marion, thanks, I'm glad that I look friendly for my age.

I won't tell you how old I am or am not.

But yeah I try to be friendly.

I'm glad that came through.

So rust is kind of cool because rust A, this is rust.

Let me make this a little bigger.

I know that you all have a harder time seeing it on

the screen because of it being smaller.

So let's go to 18 for that.

That should be big enough.

All right, cool.

So Rust is cool.

Rust is a langauge that looks a lot like,

it doesn't really look like Java but it kinda looks like Java.

it doesn't look like C, but it kinda looks like C.

And it doesn't look like Python, but it works a lot like Python.

A lot of it is very similar to me as a Python,

and having done Ruby in the past, very similar to that.

So you always have this main.rs file in your project,

and then inside that there's always this function called main.

Now Rust is a very functional programming language,

it's meant to do functional stuff.

And so yeah, you'll find a lot of functional

programming oriented stuff in Rust.

So this is FizzBuzz, so I'm sure you've all seen FizzBuzz at some point.

The idea is you take all the numbers from 1 to 100,

if the number can be divided by 3 you print out fizz,

if it can be divided by 5 you print out buzz, if you can divide it by both 3 and

5 you print out fizzbuzz, otherwise you just print out the number.

So this is a for loop, as you can tell by the use of the word for.

[LAUGH] And so this gives us, if I was doing this in Python it would be for

num in range(1, 101), right, that's what I'd write in Python.

So this is for num in range 1..101, very similar.

And so inside of there if the number divides by 3 and

the output of that is 0 then I check to see if it'll also divide by 5 and if so

print out fizzbuzz, otherwise I'm gonna print out fizz.

If it divides by 5 evenly we print out buzz, otherwise we print out the number.

Any time you see this exclamation mark like that that's a macro,

you're not exactly running a function but you're kinda sorta running a function.

This is an area I don't know yet so ignore me on a lot of this, but it's pretty cool.

This is pretty simple to read I think, and if we run it you'll see

that it's very fast, it runs very quickly so that's cool, that's fun.

Let's look at something a little bigger that I did with the help of a tutorial.

Because I don't know all of this

myself yet, so we'll find out.

tska-craft I cannot teach you C++ and Treehouse won't teach you C++, but

we will teach you C# and we can teach you Unity, so we have both of those.

And am I the person who appears in Treehouse advertisements,

I'm probably in some of them but

I'm not in all of them I don't think, [LAUGH] I don't know.

Ryan, what is the best language for framework for back-end webdev,

give you an answer straight up.

I can't give you an answer straight up because there's no answer to that,

there's no best language, there has never ever been a best language,

there will never ever be a best language, right.

It depends on the programmer, it depends on the system,

it depends on the requirements of the software, there's no such thing as a best.

There's no best text editor, there's no best IDE, there's no best web browser,

there's no best language, there's no best anything.

Yeah, okay.

Shamul, you wanna learn more about Python,

well I heavily recommend Treehouse for that.

[LAUGH] But if you don't wanna pay for Treehouse or

you can't afford Treehouse, which is totally fine and

understandable, then there is pretty good tutorials on python.org.

And there's a couple of amazing books out there,

Automate The Boring Stuff by Al Sweigart is free online I do believe.

Let's look that up real quick, Automate The Boring Stuff.

And then Python Crash Course or Crash Course Python,

I don't remember which one of those it is, is a really great book as well and

I highly, highly recommend both of those.

There you go, try that out.

So yeah, let's talk about this Rust script real quick and

then we'll go do something else.

Somebody else challenged me to a Code Fights fight,

that was fun to do so yeah, somebody come fight me on this.

My username is KennethLove, I'm really hard to pick out, you'll never find me.

All right cool, so this is a number guessing game, right, so let's run this.

So it's a number between 1 and 100 so let's guess 50,

that's too small so let's guess 75, that's too big.

So it's between 50 and 75, let's go for 65, that's too big.

So it's between 50 and 65, let's go for 60, too big, 55,

too small, 57, too small, 58, then it's gotta be 59.

Sweet, and it took me eight tries.

So some of this is my own thing that I added,

which is the how many guesses you spent, the rest of it is from the tutorial.

So we're bringing in this random crate.

Sure, Humanoid, I'll do another one against you.

And then kind of like with Python, kind of like with Java,

we have to bring in packages to be able to use them.

So in this case we're bringing in the IO package from the standard library.

We're bringing in the ordering package from the comparison package

inside the standard library.

They're actually not called packages, they're called crates,

Rust has crates which is weird but whatever.

And then here we're bringing in the Rng thing,

whatever that is, from the rand crate.

And then inside of our main function we print out guess the number,

then we generate a random number between 1 and 101.

And then here I'm creating a variable called num guesses, that's gonna be zero.

And this right here, this M-U-T, the mut,

makes it mutable, so that makes it to where you can change the value later.

Because by default in Rust all variables are immutable,

they can never be changed once they're set.

And that's actually really cool, that's really,

really handy, so yeah, that's amazing.

So then this loop here is just an infinite loop, it runs forever,

this is the equivalent of Python's while true, right.

So that's what you've got.

All right Humanoid, I'll fight you in a second.

So then we print out put in your guess, and then here we take guess and

it's gonna be this new string.

This one we mark as being mutable because we wanna change the string

once they input one.

So we take standard n,

we read the line, and then here we're saying give me a reference to guess.

Let me play with guess and if it doesn't

come back as something that's actually a string for some reason

then this expect will come out, or then this will be printed out.

So then guess, we're gonna turn that into an unsigned 32 bit number,

we're gonna trim it of any white space and then we're gonna parse it,

that's what's gonna turn it into that u32.

If it parses okay,

if it's fine, then we just give back the num, give back the number.

And otherwise if it doesn't then we continue with the loop,

we do the loop again, okay.

And then here I increment the number of num guesses by 1 and

we print out here's what you guessed.

And then here this is pretty cool, we do a match comparison, so

we take guess, we do a comparison on it against the secret number that got picked.

If it's less then we say hey, you're number was too small.

If it's bigger, if it's greater, than we print out your number's too big.

Or if they're equal then we print out you win,

here's how many tries it took you, and then we break the loop.

This is actually pretty cool, this is really,

that's 40 lines of code and that's pretty amazing.

We did a number guessing game almost exactly like this,

in Python Basics I think it was, one of my courses,

it took us way more than 40 lines to do it, so that's pretty cool.

I think Rust is neat, so

yeah, hopefully ya'll will, you'll check out Rust.

They have a tutorial on the official site that's really good so try that out.

Okay we got a new challenge, so Humanoid wants to challenge me again.

Segar says there's a Vimium Chrome extension,

I may have to check that out, I may have to give that a try.

Tska-craft wants to know how they can work for

Treehouse if they become good in one of the languages that we use.

We hire every once in a while, it's always possible, but

$1,000 per hour that's probably not gonna happen.

Just because, yeah, nobody's gonna get paid a $1,000 an hour.

$1,000 and hour if you wanna work a really small number of hours.

Sure, all right, humanoid, let's do this again.

I'm gonna take a minute off for

everyone of these maybe two just because of me reading it.

Okay given three integers, a, b, and c.

It's guaranteed that two of these Integers are equal to each other.

What is the value of the third Integer?

Bug fix task, aw, man.

Okay, extra number, if a equal to b returns c, if c not is,

That's just silly, all right, next.

Given a permutation, produce its inverse permutation.

Permutation one, three, four, two, the output should be one, four, two, three.

[MUSIC]

Okay, resulting those blank for i in range that result that append that for

i in range, the length of permutation result permutation i

minus 1 equals Result.

Okay, so that became 1.

2 became 3, [NOISE] this is one I'm not sure of,

because I'm not sure what

they're trying to do here.

List index out of range, yeah, of course it is, because,

No, this one doesn't count, this one's impossible,

I've had it before I never mentioned this.

Okay, I get the rules, I don't get the reverse permutation.

Let's go look at, well that's not gonna help me.

An inverse permutation is a permutation in which each number and

the number of the place which it occupies are exchanged.

Each number and the number of the place that it occupies

So 1 stayed in 1, 3, 0,

1, 2, 3 went to there,

4 went to there, 2 went to there?

But 4 is not in the right place, shouldn't 4 be,

And in first permutation, is a permutation in which each number and

the number of the place it occupies are exchanged.

Okay, I wanna see what this test look like.

Okay, that's that one, 1, 2, 3 check him out as 1, 2, 3,

because 1 stays in 1, 2 stays in 2, 3 stays in 3.

Here, 1 stays in 1.

Okay, do any of you all get this one?

[LAUGH] Cuz I am lost on this one.

Okay, let's just look at what the code is doing, so we have a blank list.

So then, for each number in a range the link of the permutation,

we're appending 0, okay?

So then, for an index, for the length of the permutation,

we take the permutation that number minus 1.

So, That's gonna be 0 or whatever.

So that first one's gonna be negative 1 and that should equal,

I don't think that's right, I can only change dot, dot, dot, confirm.

You know what they want, but you don't know how to do it?

Well, you're doing better than me on that one then.

So 1 stays in 1, The number and

the number of the place which it occupies.

[MUSIC]

Okay, okay, okay hold on.

So this is gonna take permutation i minus 1, right?

So that's gonna be permutation i, the first one is gonna be 1.

Minus 1 gonna be 0, so that should be equal

to something, let's not worry about that one.

The next one that comes through is gonna be 3, 3 minus 1 equals 2.

3 minus 1 equals 2, so that's the second spot,

[MUSIC]

[LAUGH] Yeah, this one, the number, so if we went to the end, the inverse is to, so,

yeah, the number goes where the item and the array at the index that is the number.

The number goes where the item and

index array at the index that is the number.

But there's no 0 in here, so

[LAUGH] one goes into 1, 4 goes into 2.

I can't make four cases Skycode,

I can't change the code beyond what I'm going right now.

Okay, I'm gonna look at this, I'm gonna get this one.

That one passed, cuz I basically sorted the thing.

Okay, so they're expecting 4 to come into the second one.

So we've got 3 which is at index 2 b Three ends up at index three.

The number goes where the item in the index at the index that is the number.

Yeah, how is this not just permutation[i]?

Like that can't be right,

yeah, 2, 4, 1,

3, yeah, whatever

Okay, I'm just gonna skip this one,

I don't even care at this point [LAUGH] we'll figure it out later.

Okay, given a string replace each, you skipped it too.

[LAUGH] Given a string replace each of its characters by

the next one in the English alphabet.

0 would be replaced by a, so

we're shifting it by 1,

okay, for letter in input string.

Now, let's do output is that.

If letter is equal to a,

output.append z elif letter

equal to z output.append('a') else,

Is it always gonna be lowercase?

It's always gonna be lowercase.

Okay, else

Output.append(string.ascii) lowercase,

String.ascii_lowercase.index[letter] plus 1.

[MUSIC]

return.joint(output).

[MUSIC]

I don't need this.

[MUSIC]

I just need this.

[MUSIC]

There we go.

[MUSIC]

We're still waiting on you.

[MUSIC]

3 is the second number, so goes where number 2 is placed.

[MUSIC]

Okay, Daithi, I think I get that.

So because 3 was the second item, we go back one to get 2, we find where the 2 is?

[MUSIC]

Yeah, I got no idea on that one.

Let's look that up, let's do Python inverse per mutation, right?

[MUSIC]

Okay, so let's see what they're doing.

[MUSIC]

So they make an array of zeroes,

that's the length of the permutation, which is fine.

For each thing in enumerate, yeah

[MUSIC]

Inverse, whatever the letter is equals that.

Yeah, see that would make so much more sense.

But they weren't doing that.

[MUSIC]

They were doing something weird.

I lost that one again?

By three seconds?

[LAUGH] By three seconds, really?

[MUSIC]

I lost by three seconds.

Aw man, that's ridiculous.

That's absolutely ridiculous.

All right we got time.

Send me another one or somebody else send me one and

let's answer some more questions.

Somebody send, give me some more questions.

[MUSIC]

And we'll talk about whatever.

Deiphy, do you think you've got something?

What's, So see, Sagar, I don't get that one, right?

1, 2, 3, 4, 5, The 2 is in position 1.

How does it go to the end?

[MUSIC]

So zeros index stays.

All the other items are placed inversely in terms of indexing.

[MUSIC]

Okay, pause,

let's do it pause, let's do it.

This could be a really good way to just test things to play with stuff.

All of you all have way more stars than me, and

it's because I don't ever play with this.

But you also all smart cuz Python 2 And that's just ridiculous.

[MUSIC]

Okay, given integer n, find n factorial.

Okay, so factorial of n blah, blah, blah.

So is this a bug fixed one.

Okay, so yeah, so we do that.

I got that one, okay.

I've done factorials before

[MUSIC]

Yeah, if you go ahead and explain I would love

to hear an explanation because I am so lost on that.

I am also lost on code fights,

it is not not letting me start these fights.

[LAUGH] Don't let me start fights, that sounds horrible.

But yeah, y'all know what I mean.

Why is programming not in our life for real,

why are there no programs to see if everyone is doing their job or not?

I'm kinda glad there's not.

Humanoid, you're marked as Python 2.

You better fix that, fix it.

I'm kinda glad that there's not.

As much as programming in real life would be fun for

being able to apply functional programming to some job I have to do and

Python washes all the dishes for me or whatever.

Yeah, I'm not all that stuck on like, I want there to be coding to monitor me.

There already is coding to monitor me all day, every day.

But [LAUGH] I don't want that to be Something I have to actually deal with.

It's just the default, and you never bothered to change it.

Well, that's just unacceptable.

You gotta have Python 3.

We gotta show that Python 3 is better and

larger and bigger than Python 2 because it is.

All right, we're gonna do this pause as soon as code fights plays along.

I'm actually really glad programming is not in real life.

Programming is already taken too seriously already.

If n is equal to zero, return n Return n.

Otherwise, we need to return

Else return n- 1.

I can't edit all those lines.

I keep forgetting that the first one is a bug fix.

I keep forgetting that the first one is a bug fix.

This should be *=

Yeah, see look, this says I'm already at two minutes.

I'm nowhere near two minutes.

The sample tests aren't even loaded James, what is my most proud Python project?

My most proud Python project is probably a package called Jinja Braces.

It's a bunch of code a friend and I wrote for Jango's class base views.

So it's a lot of stuff for Bringing in

a lot of functionality into the class face views without having to write at yourself.

It's pretty popular, or was at one time.

And yeah, it's pretty neat.

Yeah see, this is ridiculous.

It's telling me I'm at two minutes and forty something seconds.

This thing right here doesn't even exist.

Code Fights is ridiculous.

Dythe has an explanation for us.

So let's see here.

One is in position one so it stays in position one.

Okay, we all understand and agree with that one.

Three is the second number so it goes where ever number two is placed.

I get you, okay.

Four is the third number so,

it goes wherever number three is originally placed.

We'd go so on and so forth.

I got ya, okay.

That makes sense.

That makes a lot of sense.

The other stuff is a little weird.

I'm still trying to figure that one out.

Cool, I gotcha now.

[MUSIC]

Yeah, I kind of wanna try that one again, but-

[MUSIC]

This is ridiculous.

[LAUGH] What is up with code fights?

Okay, let's unblock their stuff and see if that makes it work better.

I won't block anything, code fights, you can show me your stupid ads or whatever.

And we'll see if that works better.

Cuz I have not spent four minutes on this.

Y'all have seen this.

I'm sorry.

Dahee, okay.

Dahee, that's cool.

I will do my best to remember that Dahee.

All right, So four and a half minutes later.

We still haven't loaded the fight.

[LAUGH] That's just ridiculous, what is,

okay, I'm just gonna get out of that, okay.

Code fights, fix your sight y'all.

I know you're watching This is the most important stream ever for code fights.

I know code fights is paying attention to this,

so that's why I'm looking at the camera.

Codefights, fix your site.

Look at this, this is, look at this, look a this mess.

It's not even loading, it's like five minutes.

Humanoid I see the chat probably a little bit

faster before it shows up on the screen, but not by much.

It definitely takes it a little while to show up.

BlameYouTube and Twitch.

And beam a little bit because they

all have to show up at the same time.

Okay, so I said this was times equals,

which I can't type an equals sign to save my life.

Run those sample tests.

[SOUND]?

[SOUND]

Yeah.

[SOUND] I know how a factorial works, I think.

So in 5, we start at 5, immediate five,

and doesn't equal zero, so then we would return.

[SOUND]

This is one!

[SOUND] You wanna not.

[SOUND] Can only change one, okay.

Reset, whatever.

[SOUND]

There we go.

Okay, that was not five minutes and something.

You all know that.

James Scott, I'm using an app called OBS and a service called Restream.

Restream.io lets me send the one stream out to multiple end points.

Okay, given the number of green apples on a shelf and a total number of apples,

return the percentage, excuse me, of green apples.

Really?

That sounds easier than it should be.

[LAUGH] But let's try it.

Okay, so return total divided by green times 100.

And it looks like you want an int out of that, so int.

[SOUND] I don't know,

that should be green out of total.

What am I doing?

[SOUND] Look at me failing.

Failing fourth grade math.

All right, so the longest diagonals of a square matrix are defined as follows.

The first longest diagonal goes from the top left corner to the bottom right one.

The second longest diagonal goes from the top right corner to the bottom left one.

Given a square matrix,

your task is to reverse the order of elements on both of its longest diagonals.

Reverse the order of elements on both of its longest diagonals.

Okay, so that means I want to take the first item from the first list and

swap it with the last item from the last list and

then the last item from the first list with the first item from the last list.

The middle item stays the same.

Okay, that seems simple enough.

Okay, so let's look back over here.

Poss wants to practice a bit more.

You're fine.

Don't worry about it.

You're doing great.

James has an app OBS, cool.

Why don't we keep C++ or C at Treehouse?

We don't really find them necessary.

It's friendly enough but it just doesn't need to be.

Okay, so the length of

the matrix is always, okay.

[SOUND] But they're not always the same

[MUSIC]

Aha, okay.

So, diagonals.

[SOUND] All right, so

let's get diagonals = 0.

It's always gonna be 0.

[SOUND] I wanna make pairs of these.

0 and then

matrix.

[MUSIC] And then matrix- 1.

[SOUND] Right?

I may be doing this in a really long, drawn out way.

[SOUND] So then. [MUSIC]

Yeah, yeah, yeah, let's do this.

So for x.

[MUSIC]

No.

For I in

range(len(matrix))-

1.

[MUSIC]

.append and

we're going to append i and

then len(matrix)- i + 1.

[MUSIC]

So I'll break this onto a new line so y'all can see what I'm doing.

So, we're appending.

In this case, it would be 0 and then 9, right?

[MUSIC]

Or we just want I + 1,

[MUSIC]

Times -1 which I wanna reverse that.

[MUSIC]

Okay, so I think that will work.

So the new_matrix = this.

It's an empty list.

[SOUND] for

m in matrix.

So for each item in the matrix, I want an index on that too, enumerate.

[MUSIC]

new_matrix.

[MUSIC]

new_line =.

[MUSIC]

I am lost on this one.

I need code to sit down and think this one through but, okay.

So I want to take the first item on the first one.

[MUSIC]

So that's gonna be equal to m.

Whatever is in m, and then we wanna take new_line.

[MUSIC]

And we wanna take

diagonals I, 0.

So whatever that item is, and we want that to be equal to.

[MUSIC]

We don't even need that.

[MUSIC]

We don't even need that.

Okay, so we can just do this.

We can do matrix, which means really I can do this as for In,

[MUSIC]

range(len(matrix)), right?

So, matrix, the one that we're on.

[SOUND] The zeroth item.

Whatever item comes out of diagonals.

There.

[MUSIC]

Is equal to matrix.

[MUSIC]

I + 1 times -1,

diagonals I, 1

[MUSIC]

I don't think I'm quite right on that one.

[MUSIC]

Okay, That should always go to the other side.

[MUSIC]

>> That should always get the last item, right?

And I don't need new_matrix.

[MUSIC]

The code's fine.

This should be minus one.

So some of these I got completely wrong.

Yeah, ha ha, end is going to be equal to matrix.

Matrix i plus 1 times

negative 1 diagonals, i negative 1.

Okay, so that's the last value, right?

So, and then let's say start is equal to matrix

I diagonals I zero,

okay, so that's the start value and that's the last value.

So the start value is gonna be equal to end.

And the last value here is gonna be equal to start.

And run those tests.

No.

I forgot to get the last one.

Okay, I'm- [SOUND] Okay, so

I also have to get, The last one on the end.

Can you create a string and swap the numbers there and

recreate a square matrix?

I probably could on that one.

All right lets see if I can remember

it was [INAUDIBLE] Did I get that one right?

I could probably do that one.

Strings, swap the numbers, then recreate a square matrix.

It's not any easier with a string than it is with a list, so

So it's fine, okay.

Here, we'll do this.

We'll do Start Left, End Right, and

we'll do Start Right and End Left.

So Start Right Is gonna be equal to matrix, i,

so whatever road we're on, -1, right?

Always, and this is gonna be equal to matrix

[MUSIC]

Here,

[MUSIC]

Zero always, right?

So then this one here ends up equaling

and_right and matrix i- 1,

it's not always gonna be- 1 though.

That's gonna be equal to that.

This one,

Here This

last one will be equal to start left, this one will be equal to start right.

This isn't exactly right.

This is totally wrong.

Invalid syntax, yeah you're right.

[MUSIC]

How did that come out as 4?

Because of that -1, So.

All right, I'm not worried about this one,

[LAUGH] I'm giving up on this one, you beat me on this, Humanoid,

we'll find out what happens later, So, yeah so we're at the end of a stream.

Let's take questions.

Anybody have questions let me know.

If I have another code fight here I will check it out later.

Okay, it's just that one.

Anybody that wants to challenge me go for

it, I don't know how often I'll be checking out, but I will later so

we'll talk about that.

If you have any questions ask them now I'll answer them before the end of

the stream.

And Critical Toxic would like me to do more discord bots.

I think I will actually.

It's a new level, woo.

And I lost because that totally took me 6 minutes and 53 seconds.

Totally, 100%, right humanoid?

There's no way that didn't take me seven minutes.

Good fight.

Okay, whatever.

Anyway, so I'll do more discord bots.

I wanna do another discord bot.

I really wanna do one that's over the Voice feature of discord.

But that's gonna be a little ways off.

We'll get to that later.

But yeah I definitely wanna do more discord bots.

If i remember correctly my very first Stream that I did was a Discord bot.

No, that was the Django travel blog, right that was something different.

Anyway though I will do more Discord bots.

I will be streaming over the weekend I will be doing

Some streams for the Ludum Dare that I'm doing.

So if you want to watch me do panicky Rust code and

creative sprites and maps and things like that, be sure to tune in.

That will be one my own Beam channel, though.

That will be at theme.pro/kennethlove, it won't be here on treehouse.

I will not be streaming on treehouse,

I'll just be streaming on my own personal channel.

So if you wanna come watch that, feel free.

You can come and watch.

I'd love to have you there.

I'll have chat open.

We can talk about stuff.

It may be just music playing or something, or it may be Something else.

I'm not sure. I don't know if

there will be any audio or not.

You may just get to watch me type and put down pixels.

So, thank you all for watching.

Glad to have had you here.

Tune in next week.

We'll do something else.

I think I'm going to start doing.

I want to start playing around with languages, so if you all would like to see

me Do tutorials, practice learn different languages.

Let me know what different languages you like to see and maybe I'll do some.

It will be a lot of mistakes.

Many mistakes will be made, but that's fine.

Mistakes are how we learn.

So, thank you all for watching and I will see you all next week.

Have a great weekend.