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Exam 13: Video Games: Multithreading, Event Handlers, Static Variables

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Question 1

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Match each definition with its term. -First-come first-served data structure.

A) Queue
B) Static variable
C) Decorator
D) Name mangling

E) None of the above
F) B) and D)

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Question 2

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Case Study 2: 1. import turtle 2. 3. class Etch: 4. def __init__(self): 5. self.__myT = turtle.Turtle() 6. self.__myScreen = turtle.Screen() 7. self.__myT.color('blue') 8. self.__myT.pensize(2) 9. self.__myT.speed(0) 10. self.__distance = 5 11. self.__turn = 10 ... 19. def fwd(self): 20. self.__myT.forward(self.__distance) -Refer to the session in the accompanying Case Study 2. The Etch class uses the inheritance approach to working with a turtle.

A) True
B) False

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Question 3

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To hide a function from use outside of the class, begin the name with:

Match each definition with its term. -Hides any functions from outside of the class and starts with __.

What is the main structure of an event-driven program?

Passing ____ to a turtle function that is used to register a callback effectively cancels the callback mechanism.

What is the name of the event loop for a turtle?

A(n) ____ variable is shared by all instances of the class.

Before using the screen to respond to keyboard events, call the ____ method of Screen.

Match each definition with its term. -A special instruction to the Python interpreter that starts with @.

How do you make a class multithreaded in Python?

The main difference between keyboard callbacks and mouse callbacks is that the function we write to accept mouse callbacks must accept two parameters.

How would you detect when two turtles collide?

Typically, desktop applications are single-threaded.

Case Study 2: 1. import turtle 2. 3. class Etch: 4. def __init__(self): 5. self.__myT = turtle.Turtle() 6. self.__myScreen = turtle.Screen() 7. self.__myT.color('blue') 8. self.__myT.pensize(2) 9. self.__myT.speed(0) 10. self.__distance = 5 11. self.__turn = 10 ... 19. def fwd(self): 20. self.__myT.forward(self.__distance) -Refer to the session in the accompanying Case Study 2. Explain the composition approach used by the Etch class.

Match each definition with its term. -Variable that is shared by all instances of a class and is available to all the methods in the class.

Explain how to set up a callback for mouse events on the turtle.

Describe the __moveOneStep method of the AnimatedTurtle class presented in your text. What is the significance of the two underscores in the method name?

Case Study 1: 1. class EventHandler: 2. def __init__(self) : 3. self.__queue = [] 4. self.__eventKeeper = {} 5. 6. def addEvent(self, eventName) : 7. self.__queue.append(eventName) 8. 9. def registerCallback(self, event, func) : 10. self.__eventKeeper[event] = func 11. 12. def run(self) : 13. while(True) : 14. if len(self.__queue) > 0: 15. nextEvent = self.__queue.pop(0) 16. self.__eventKeeper[nextEvent]() 17. else: 18. print('queue is empty') -Refer to the session in the accompanying Case Study 1. What kind of loop is shown on lines 13-18?

What are some of the benefits of extending a class from Thread?