Question

QUESTION 31

1. The tkinter command _____ kicks off the GUI event loop.

   		goloop()
   		doloop()
   		mainloop()
   		loopDloop()

2.5 points   

QUESTION 32

1. Which of the following statements about superclasses and subclasses is true?

   		A subclass is not connected to a super class in any way
   		A superclass inherits from a subclass.
   		A superclass extends a subclass.
   		A subclass extends a superclass.

2.5 points   

QUESTION 33

1. Pickled objects can be loaded into a program from a file using the function ____.

   		pickle.load
   		cPickle.read
   		cPickle.input
   		cPickle.pickleIn

2.5 points   

QUESTION 34

1. How many constructors can be defined for each class?

   		classes don't have constructors
   		Only one constructor may be defined
   		"At least one, but as many as needed"
   		"At least one, but no more than five"

2.5 points   

QUESTION 35

1. A description of encapsulation would include the act of hiding the implementation details

   True

   False

2.5 points   

QUESTION 36

1. For the following code the variable named name1 ____.

   val = StringVar()
   name1 = Entry(root, width=5, textvariable=val)

   		holds a reference to the Entry box object.
   		contains any text that the user might have typed into the entry box
   		contains the value None
   		holds the value of True

2.5 points   

QUESTION 37

1. "Which of the following method headers represent a constructor, assuming we add a colon to each?"

   		def init(self)
   		def __init__(self)
   		def _init(self)
   		def init()

2.5 points   

QUESTION 38

1. The first parameter in a widget constructor, if not used in a class, is the name of the containing element. Pick True for this answer.

   True

   False

3.5 points   

QUESTION 39

1. Using a try-except block you would filter for the existance of an error in opening a file by using the IOError error type

   True

   False

2.5 points   

QUESTION 40

1. What prints when this runs?

   class Amphibians :
   def __init__(self, name="amphibian") :     
   self.name = name     
   def display(self) :     
   print(self.name)

   class Frog(Amphibians) :     
   def __init__(self, name) :   
   self.name = name
   super().__init__(name)
   
   f = Frog('Kermit')
   f.display()

   		amphibian
   		Kermit
   		None
   		Frog

Answer 1

Answer 31:mainloop()
Answer 32:A subclass extends a superclass.
Answer 33:pickle.load
Answer 34:"At least one, but as many as needed"
Answer 35:False
Answer 36:contains any text that the user might have typed into the entry box
Answer 37:def __init__(self)
Answer 38:True
Answer 39:True
Answer 40:Kermit