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necessary methods

You needed to create some methods for the new SoundPanel()
class. You were asked to identify which of the following behaviors you
thought you needed to create methods for:
You’ve already created
Someone moves the volume slider. event handlers that Someone clicks the checkbox.
do something like this.

The computer starts up. You get to the end of the track.
What do you need
Create the interface. to do to create
the interface?

Q: Why is there a method to create the widget? Q: So you can’t always see objects on the screen then?

A: There isn’t a method to create the widget. But there is a A: No, most objects run quietly in memory and they don’t have
method to create the interface. That method will run immediately any display at all.
after the widget is created. Q:
Q: I don’t get it. What’s the difference between a widget Is Python the only object oriented language?

and an object? A: Lots of languages—such as Java, C#, and Ruby—use
objects to handle complexity.
A: A widget is a particular type of object. It’s an object that you
can add to a graphical user interface. Q: So learning object orientation is a good way of getting
Q: So there are some objects that are not widgets? into other languages?

A: Yes, understanding object orientation gives you a insight into
A: Absolutely. Most objects are used behind the scenes in how other languages think.
programs. All of the numbers and strings you’ve used so far have
actually been objects.

368 Chapter 10