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

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 is held in self.__queue?

The turtle module's ____ method is used to register callbacks for mouse events.

A queue enforces a first-come first-served strategy for handling events.

Describe the static method in the video game presented in your text. What is special about static methods?

Which of the following parts of an event-driven program are managed by a game maker rather than by the Python event handler?

A ____ is a data structure that works like a to-do list.

The ____ function causes the thread to pause for the number of seconds passed as a parameter.

Describe the overall structure of an event-driven program.

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. How would you call the function associated with the key 'mouse'?

Explain the difference between a single thread of execution and multithreading.

What callback registration functions does the turtle module provide?

In a multithreaded class, the ____ method creates a new thread and calls the run method of the class inside that new thread.

A Python-mangled name that is hidden outside its class starts with a @.