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In this video, we want to work on our pause function, and this one's a little bit more tricky because

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think about it, if we pause a song, we have to know whether or not the song is paused or not when

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we unpause it.

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So and it's just one button.

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We're not clicking a pause and unpause button.

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There's not two buttons, just one button.

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So we need to do a little bit of hacking to get this to work.

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So let's come down to our buttons here and find our pause button and off.

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That's the image.

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Let's go down here, pause button right there and let's give this a command equal pause.

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Now, normally this is how you issue a command, but we need to pass something into this function when

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we click the button and we need to pass in whether or not the button has already been clicked in the

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past.

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Is our song currently paused or not?

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We need to pass that in.

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So to pass anything with a function.

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Normally you just put these parentheses and then you type in the thing you want to pass and we want

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to type in a variable called pause.

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Which we haven't created yet.

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We'll do that in just a second, but the thing about Cantera and passing in commands like this through

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a button, you can't do the normal python function thing, which is this naming the the thing you want

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to call and then passing it.

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Then you have to use something called a lambda.

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And in order to use a lambda, you just type in the word lambda and a colon and a space.

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And again, this is a lower case.

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L. It's not capital.

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Sublime text just makes it look that way.

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Drives me crazy.

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And then the rest of the stays the same.

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So we're passing this paused variable into our pause function.

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So let's go ahead and start creating these things.

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So let's come down here below our stop function and let's create pause function.

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And to do that, let's go define pause now.

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Since we're passing in something into this function, we need to account for that, so let's do that

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right here.

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Let's call this is paused.

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Now, inside of this function, we can use this variable is Porres, which will become whatever it is

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we passed in right here.

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Basic function stuff with Python.

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If you're not really familiar with Python programming, this may be a little tricky if you know a little

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python.

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This makes perfect sense.

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If it doesn't make sense to you, don't worry that much.

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It will become more apparent as we build this out.

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So we're passing this paused variable, but it doesn't exist yet.

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So let's create it and we need to do that outside of this paused function we just created.

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So right here above it, let's go create paused variable.

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Here we go, and I'm going to call Porres equals I'm going to set it equal to false.

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Now we want to use this variable all over the place, so I'm going to make this global.

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So global paused OK.

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OK, so now what we're saying here is when the program starts, right, we're creating this variable

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paused and what is it?

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It's false.

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Why or when the program starts.

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A song hasn't been paused yet.

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It's false.

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It's false that it's been paused.

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If if a song had been paused, paused would be true since.

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Since the song hasn't been paused since the program just started, we're going to set it equal to false.

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So basically when we click this button down here, our pause button, we're going to pass in that paused

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variable, which by default is false.

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So we're passing in false basically.

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Right.

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So now when we're in this function is paused is the variable.

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We're calling this inside this function just to make it different from pause.

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Right.

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And by default, it will be false.

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So instead of here, let's create another another global.

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And let's call it paused and let's say pause equals is underscore paused, OK, so now we can do some

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logic so we can say if paused equals true.

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And to do that, we just say if paused.

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That means is it true?

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If it was true, then unpause.

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Pause, right?

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So if the thing.

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Is if it's already been paused, if it's true, then unpause it.

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Else, it's false, it hasn't been passed, so if a song hasn't been paused and we click this thing,

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it means we did that because we want to pause the song so we can pause it to remember when we first

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click this.

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This is false.

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So this is not true.

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So this won't happen.

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This is true.

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It is false.

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It's true that it's false.

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That makes sense.

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So opposite.

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So a little bit a little weird, but that's how we do this.

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So how do we unpause a song, what we call pygame.

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Mixer music, it's always pygame or not music, dot unpause.

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Right now we want to set pause equal to false.

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So if paused is true, that means the song has been paused, then unpause it and then set pause to false

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because we unposted is no longer paused.

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So it's false.

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It's not paused, otherwise pause it.

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So how do we pause it?

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Same deal pygame that Mixu.

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That music.

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Dog paws.

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And then again, we want to now change paused to true.

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So if the song has not been paused, if it's false, right.

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Then posit, if it's now paused, set pause equal to true, because we just paused it, so it's true

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now here we unpause that so it's false now.

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Makes us so.

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All right, let's go and say this and run it.

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Just pull this over, add some songs you.

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Let's play one,

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was it?

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UNbased.

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Was it?

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Positive stop like another one.

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It was.

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I'm OK, and that works, so a little weird, sure, but if you have any sort of experience with Python,

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this should make sense.

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If not, I don't know, just copy the code and try to figure it out later.

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But that's all for this video.

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In the next video, we'll start to look at these forward and back buttons.