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So far, we have developed this program.

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We have this ADD button and this added button and this video.

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We're going to add a complete button next to the edit button and also an exit button somewhere down

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below the list box.

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Here.

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The complete button will delete the selected.

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To do so, we select it to do press complete the to do is deleted from to dos the text and also from

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this list box, while the exit button will close the program.

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So the exit button will be an addition to this button.

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Both that and the exit button will close the program.

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Let's begin.

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Let's ignore this error for now.

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We're going to fix that also later on.

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So let's look at the current layout.

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We have the label in one row, then we have the input box and the add button in another row.

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And then in the third row we have the list box and the edit button.

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Here.

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We want to also add a complete button in the same row so to the right of the edit button.

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So let's create that complete button.

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On the edit button, we declare a complete button.

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So that is the same variable name as this one.

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And this is going to be again, a button with a label complete.

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Now, since this line is getting too long, I want to split it into several lines so it would make sense

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to have one row in one line.

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So we have the label row and then we have this row with the input box and the edit button.

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And then after the comma here, I split it again.

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So one row, two rows, three rows.

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Let's run to see what we have.

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Yeah, so it looks fine.

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Edit And complete now.

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We should add a case complete.

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So we have case at we have case.

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Edit Let's add a case complete.

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So complete is the label of the button.

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This one in here.

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When the user presses that button, complete that string it's stored in event and this variable in here.

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So we match that event.

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If the event is complete, what do we want to do?

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Well, we want to delete the given item.

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So first we want to get the to do to complete, just like we did for edit.

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We got to do to edit from values to dos.

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So which means that when the user selects, for example, get the core, that dictionary is the values

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variable.

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So we extract that list out of that and also we extract that string out of that list using zero this

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index operation.

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And now we want to remove that to do from to dos the text.

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So first we get the to dos from to dos the text using functions that get to choose.

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This will give us the list of current to dos inside to dos the text.

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We're here and then we say to dos that remove.

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So we use the remove methods.

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It's a list method to do this list.

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So to do that remove or removes a to do for example, if we had a is equal to one, two and three and

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we say a dot remove three that is going to remove item three.

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So a now is updated to that.

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It only has one to the first two items.

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So we want to remove the two due to complete.

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And then once we update the list, we say function.

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That's right to dos and we send it to this list to that right to dos function so that the right to this

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function writes that list to to dos the text.

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And lastly, we want to say window to dos.

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So this point to the list box instance, this instance no to that this instance has to do as a key.

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So therefore windows to dos points to that list box.

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So we want to update the list box.

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We want to place a new value for values.

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Values is the list of the items.

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We want to put a new list.

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The new list is to dos the list which is updated from that remove method.

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So if I run this now and I try to remove get the car and then I press complete, get the core disappears

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from the list box.

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However, it is still in the input box because we haven't updated the input box.

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So let's update the input box as well.

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That is window with the key.

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Let's see the input box which is the input text.

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I sometimes refer to it as input box.

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It has a key to do.

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Therefore we say window to do that.

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Update.

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This has a value argument, not values.

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It contains one single value and we want to update it to an empty string.

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So just write two single quotes or to double quotes wherever you prefer.

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Run.

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Go without pi.

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Let's remove clean the program.

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So complete clean.

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The program is removed from the list box.

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It's also removed from the input text here and also from to dos the text.

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You see, it's not here anymore.

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So that was the complete button.

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Now let's add an exit button as well.

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I said that exit is going to be in a separate line.

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Therefore I'll place a comma here in this row and add a new list in here.

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So notice the brackets.

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We have this bracket which closes in here.

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Those are the main out brackets.

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And then we have the rows, that one, that row and a third row here.

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This is going to be an exit button which should be created in here as that button.

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Exit our van.

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We go down here to add a case exit.

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So that is the label of the button.

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So if the user presses exit, exit is going to be stored in the event variable.

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So we check if the event is add, edit, complete or exit.

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And if it is exit, we break the loop.

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So let's try where we have exit, we press exit and the program exits.

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If we press this button now, we don't get that error anymore that you saw previously.

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So that also fixes that error.

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Before we close this video, let's not forget to commit.

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So press that button and implement the complete and exit buttons.

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You can commit that message if you like.

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You can also push the changes if you want to synchronize them with GitHub.

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It's fine to push the changes just after a few commits, but this is also fine, especially when you're

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learning.

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So if you want to push them, just push them on GitHub.

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There's no harm done.

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So with that, I'll see you in the next video.

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Thanks.