Question 1

What is the root class of Python's built-in class hierarchy?

Accepted Answer

A)   self
B)   list
C)   dict
D)   objectE) B) and D)
F) None of the above

Question 2

If a programmer calls the next function on an iterator object and there is no current item in the sequence, the next function returns the Null item.

Accepted Answer

A) True 
 B)False

Question 3

The __init__ method in the parent class is automatically called by a subclass of the parent class.

Accepted Answer

A) True 
 B)False

Question 4

When looking at a hierarchy of abstract classes, the classes trend from the more specific to the more general going from the top to the bottom of the hierarchy.

Accepted Answer

A) True 
 B)False

Question 5

In the constructor for the ArrayBag class shown below, what is the missing code?
Def __init__(self, sourceCollection = None) :

AbstractBag.__init__(self, sourceCollection)

Accepted Answer

A)   items.add(self) 
B)   self.items = Array(ArrayBag.DEFAULT_CAPACITY) 
C)   self.items = ArrayBag.add(sourceCollection) 
D)   add.items(self, sourceCollection) E) B) and C)
F) None of the above

Question 6

A set of methods that could be used on other data structures besides the one they were created for could be used in a general abstract class.

Accepted Answer

A) True 
 B)False

Question 7

What is a class called when the purpose of it is to eliminate redundant methods in other classes?

Accepted Answer

A)   concrete class
B)   abstract class
C)   subclass
D)   child classE) A) and D)
F) B) and D)

Question 8

Under which circumstance can an instance variable be moved to an abstract class?

Accepted Answer

A)   when it refers to the same type of data structure
B)   when it is unique to a particular concrete class
C)   when different data structure types are referenced by the variable
D)   when it directly modifies the underlying data structureE) A) and C)
F) B) and C)

Question 9

Which of the following is true about the three bag classes (LinkedBag, ArrayBag, ArraySortedBag) ?

Accepted Answer

A)   they are abstract classes
B)   they implement the bag interface
C)   the are all superclasses
D)   LinkedBag is a subclass of ArraySortedBagE) All of the above
F) A) and B)

Question 10

An abstract class captures the common features and behavior of a set of related classes.

Accepted Answer

A) True 
 B)False

Question 11

When considering the ArrayBag class and the ArraySortedBag class, which of the following is true?

Accepted Answer

A)   the ArraySortedBag class is the parent of the ArrayBag class
B)   the ArraySortedBag class is a subclass of ArrayBag
C)   the ArrayBag class is a subclass of ArraySortedBag
D)   the ArrayBag class is the child class of ArraySortedBagE) A) and D)
F) A) and B)

Question 12

What would be the purpose of creating a more general abstract class called AbstractCollection ?

Accepted Answer

A)   to group methods used by a single subclass
B)   to hide the details of the methods used in your abstract classes
C)   to create objects from a client application
D)   to group methods that can be used for other types of collectionsE) B) and D)
F) B) and C)

Question 13

An abstract class is always used to create objects in client applications.

Accepted Answer

A) True 
 B)False

Question 14

By using inheritance to create new classes, you increase code redundancy.

Accepted Answer

A) True 
 B)False

Question 15

When you use inheritance to customize a class, the existing and new class have identical behavior.

Accepted Answer

A) True 
 B)False

Question 16

What is the syntax for the calling the __init__ method in the ArrayBag class from the ArraySortedBag class?

Accepted Answer

A)   self.init(ArrayBag, sourceCollection) 
B)   ArrayBag.self(__init__, sourceCollection) 
C)   ArrayBag.__init__(self, sourceCollection) 
D)   __init__.ArrayBag(self, sourceCollection) E) C) and D)
F) B) and D)

Question 17

In the ArraySortedBag class, why must the self argument be passed to the __init__ method of ArrayBag?

Accepted Answer

A)   to ensure the add method in ArraySortedBag is called if a source collection is specified
B)   to ensure that ArraySortedBag calls the correct __init__ method
C)   to ensure that ArrayBag calls its own __init__ method
D)   to ensure the add method in ArrayBag is called if a source collection is specifiedE) B) and C)
F) All of the above

Question 18

A primary purpose of using inheritance is to eliminate redundant code.

Accepted Answer

A) True 
 B)False

Question 19

When calling the __init__ method from a subclass, you need to include the self argument.

Accepted Answer

A) True 
 B)False

Question 20

The root class of the Python hierarchy is called object .

Accepted Answer

A) True 
 B)False

Exam 6: Inheritance and Abstract Classes

A set of methods that could be used on other data structures besides the one they were created for could be used in a general abstract class.

Correct AnswerverifiedShow Answer

What is the syntax for the calling the __init__ method in the ArrayBag class from the ArraySortedBag class?

Correct AnswerverifiedShow Answer

By using inheritance to create new classes, you increase code redundancy.

Correct AnswerverifiedShow Answer

In the constructor for the ArrayBag class shown below, what is the missing code? Def __init__(self, sourceCollection = None) : < missing code > AbstractBag.__init__(self, sourceCollection)

Correct AnswerverifiedShow Answer

The __init__ method in the parent class is automatically called by a subclass of the parent class.

Correct AnswerverifiedShow Answer

What would be the purpose of creating a more general abstract class called AbstractCollection ?

Correct AnswerverifiedShow Answer

When considering the ArrayBag class and the ArraySortedBag class, which of the following is true?

Correct AnswerverifiedShow Answer

What is a class called when the purpose of it is to eliminate redundant methods in other classes?

Correct AnswerverifiedShow Answer

When looking at a hierarchy of abstract classes, the classes trend from the more specific to the more general going from the top to the bottom of the hierarchy.

Correct AnswerverifiedShow Answer

What is the root class of Python's built-in class hierarchy?

Correct AnswerverifiedShow Answer

If a programmer calls the next function on an iterator object and there is no current item in the sequence, the next function returns the Null item.

Correct AnswerverifiedShow Answer

Which of the following is true about the three bag classes (LinkedBag, ArrayBag, ArraySortedBag) ?

Correct AnswerverifiedShow Answer

When calling the __init__ method from a subclass, you need to include the self argument.

Correct AnswerverifiedShow Answer

An abstract class is always used to create objects in client applications.

Correct AnswerverifiedShow Answer

The root class of the Python hierarchy is called object .

Correct AnswerverifiedShow Answer

An abstract class captures the common features and behavior of a set of related classes.

Correct AnswerverifiedShow Answer

When you use inheritance to customize a class, the existing and new class have identical behavior.

Correct AnswerverifiedShow Answer

Under which circumstance can an instance variable be moved to an abstract class?

Correct AnswerverifiedShow Answer

In the ArraySortedBag class, why must the self argument be passed to the __init__ method of ArrayBag?

Correct AnswerverifiedShow Answer

A primary purpose of using inheritance is to eliminate redundant code.

Correct AnswerverifiedShow Answer

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What is the syntax for the calling the init method in the ArrayBag class from the ArraySortedBag class?

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In the constructor for the ArrayBag class shown below, what is the missing code? Def init(self, sourceCollection = None) : < missing code > AbstractBag.init(self, sourceCollection)

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The init method in the parent class is automatically called by a subclass of the parent class.

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When calling the init method from a subclass, you need to include the self argument.

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In the ArraySortedBag class, why must the self argument be passed to the init method of ArrayBag?

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