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Welcome back.

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This is a quick optional video that well, with something that you probably won't use, but I want you

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to just know that it's out there.

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And that is there's actually an extra data type that I didn't talk about, and it's called complex.

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And as the name suggests, it's pretty complex.

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However, a complex number, again, is a number that is a third type instead of int and float.

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We also have this type for numbers.

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Now the reason I'm not really teaching complex is that you only use this if you're doing something really,

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really complex math.

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Most of the time you'll never use it.

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I personally have never used it, but it is good to know that it exists.

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It's the equivalent to a real number and you can read about complex numbers if you want.

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But again, that's something that you don't need to worry.

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99.9% of the time.

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Another thing I want to talk to you about is this idea that these integers and floats get stored, such

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as five in memory as binary, that is as binary numbers, ones and zeros.

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And there's actually an action or function that we can use in Python called bin for binary.

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And you can see that a bin returns the binary representation of an integer.

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So it's going to return whatever the binary version of five is.

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If I click run here.

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Well, I have to print, remember?

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So let's print.

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And Click Run.

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And I get the binary representation now instead of all zeros and ones.

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There's also this idea of B, and that is what Python uses underneath the hood to say A when I see this

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number with zero B, that's a binary number.

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But if I Google binary number five.

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I see that the binary number for five is 101, which again, that's what we see here.

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So that's really cool.

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Really interesting.

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Just to know that it exists, by the way, just for fun, let's say that we want to turn this into a

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decimal.

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Let's say we're the computer and we just retrieve this binary number.

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I can do it and then wrap this.

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Like this in single or double quotes.

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And then with the inte, i can also say, hey, I want this return to a number that is base ten, which

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is what us humans use.

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So if I actually do print here.

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And Click Run.

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Well, actually, we have to do base two here, right.

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Because what we're saying is, hey, this number is base two and convert it to integer and base two.

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Number is all zeros and one.

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It's a binary number.

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So if I click run here.

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Look at that.

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I get five.

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So in your head you can think of it this way.

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When we store a number like five, an integer like five, when a computer retrieves that number, let's

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say we're doing some addition.

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Well, it's going to grab this for memory.

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It's going to say, well, this is a binary number and I'm going to convert it into integer.

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Very, very cool.

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Now, the reason I taught this here, you won't see this a lot in beginner courses and especially so

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early in the course, but I think it's an important principle, although you might not get tested on

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this ever.

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For you to just understand how things are working underneath the hood, I believe, is an important

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thing for you to do in order to become a great developer.

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So hopefully this doesn't confuse you too much.

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I'll see you in the next video.

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Bye bye.