Question 1

In the ArrayBag class, what function does the __str__ method use to generate a sequence of strings from a bag?

Accepted Answer

A)   count
B)   len
C)   add
D)   mapE) B) and C)
F) All of the above

Question 2

The __iter__ method is identical in the ArrayBag and LinkedBag classes.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following is a visual aid to help catalog resources in your software toolbox?

Accepted Answer

A)   docstring
B)   method mapper
C)   unit modeler
D)   class diagramE) A) and D)
F) C) and D)

Question 4

When used with a bag object, the in operator returns an integer value.

Accepted Answer

A) True 
 B)False

Question 5

The clear method empties a bag.

Accepted Answer

A) True 
 B)False

Question 6

The running times of the operations of ArrayBag and LinkedBag are similar.

Accepted Answer

A) True 
 B)False

Question 7

Once the designer of a collection class has obtained its interface, the implementation of the class includes completing code for the methods.

Accepted Answer

A) True 
 B)False

Question 8

Software bags can grow as more items are added, or they can shrink as items are removed.

Accepted Answer

A) True 
 B)False

Question 9

What word is best defined as the use of common names for operations on different types of collections?

Accepted Answer

A)   anachronism
B)   polymorphism
C)   concatenation
D)   modularizationE) C) and D)
F) B) and D)

Question 10

The statement in the ArrayBag constructor to copy an item from a source collection to a new ArrayBag object is self.init(item) .

Accepted Answer

A) True 
 B)False

Question 11

Whenever you need to use the logical size of the bag within a class definition, run len(self) instead of referring directly to the instance variable self.size .

Accepted Answer

A) True 
 B)False

Question 12

An interface's documentation gives you enough information to know how to use or call a method and what to expect it to accomplish and return.

Accepted Answer

A) True 
 B)False

Question 13

In the Bag class defined in the chapter, what is one of the purposes of the sourceCollection argument in the __init__ method?

Accepted Answer

A)   to create a bag with the contents of another collection
B)   to delete the contents of an existing collection
C)   to define source code for the method
D)   to add data to an existing bag collectionE) All of the above
F) A) and C)

Question 14

In the ArrayBag class, why must the ArrayBag object track its logical size in a separate instance variable?

Accepted Answer

A)   because the physical size is always smaller than the logical size
B)   because the initial size of the object can't be changed
C)   because the logical size will likely differ from the array's capacity
D)   because the array size and the logical size are identicalE) None of the above
F) All of the above

Question 15

What is it called when the contents of two bags are combined into a third bag?

Accepted Answer

A)   iteration
B)   appending
C)   concatenation
D)   reductionE) A) and B)
F) A) and C)

Question 16

When defining the Bag class, the __init__ operation is the constructor for the class.

Accepted Answer

A) True 
 B)False

Question 17

Why won't some of the ArrayBag methods require changes when implementing the LinkedBag class?

Accepted Answer

A)   because the methods don't use the self variable
B)   because the ArrayBag class is based on lists
C)   because the LinkedBag object is not iterable
D)   because the methods don't directly access the array variableE) C) and D)
F) A) and B)

Question 18

You should always try to hide the implementing data structures behind a wall of method calls on the object being implemented.

Accepted Answer

A) True 
 B)False

Question 19

The __iter__ method uses a yield statement to send each item to the calling for loop.

Accepted Answer

A) True 
 B)False

Question 20

A bag is a type of ordered collection.

Accepted Answer

A) True 
 B)False

Exam 5: Interfaces, Implementations, and Polymorphism

What is it called when the contents of two bags are combined into a third bag?

Correct AnswerverifiedShow Answer

Once the designer of a collection class has obtained its interface, the implementation of the class includes completing code for the methods.

Correct AnswerverifiedShow Answer

Which of the following is a visual aid to help catalog resources in your software toolbox?

Correct AnswerverifiedShow Answer

Software bags can grow as more items are added, or they can shrink as items are removed.

Correct AnswerverifiedShow Answer

An interface's documentation gives you enough information to know how to use or call a method and what to expect it to accomplish and return.

Correct AnswerverifiedShow Answer

When defining the Bag class, the __init__ operation is the constructor for the class.

Correct AnswerverifiedShow Answer

The running times of the operations of ArrayBag and LinkedBag are similar.

Correct AnswerverifiedShow Answer

Whenever you need to use the logical size of the bag within a class definition, run len(self) instead of referring directly to the instance variable self.size .

Correct AnswerverifiedShow Answer

In the ArrayBag class, why must the ArrayBag object track its logical size in a separate instance variable?

Correct AnswerverifiedShow Answer

What word is best defined as the use of common names for operations on different types of collections?

Correct AnswerverifiedShow Answer

You should always try to hide the implementing data structures behind a wall of method calls on the object being implemented.

Correct AnswerverifiedShow Answer

Why won't some of the ArrayBag methods require changes when implementing the LinkedBag class?

Correct AnswerverifiedShow Answer

The __iter__ method is identical in the ArrayBag and LinkedBag classes.

Correct AnswerverifiedShow Answer

The statement in the ArrayBag constructor to copy an item from a source collection to a new ArrayBag object is self.init(item) .

Correct AnswerverifiedShow Answer

In the ArrayBag class, what function does the __str__ method use to generate a sequence of strings from a bag?

Correct AnswerverifiedShow Answer

The __iter__ method uses a yield statement to send each item to the calling for loop.

Correct AnswerverifiedShow Answer

In the Bag class defined in the chapter, what is one of the purposes of the sourceCollection argument in the __init__ method?

Correct AnswerverifiedShow Answer

A bag is a type of ordered collection.

Correct AnswerverifiedShow Answer

The clear method empties a bag.

Correct AnswerverifiedShow Answer

When used with a bag object, the in operator returns an integer value.

Correct AnswerverifiedShow Answer

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When defining the Bag class, the init operation is the constructor for the class.

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The iter method is identical in the ArrayBag and LinkedBag classes.

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In the ArrayBag class, what function does the str method use to generate a sequence of strings from a bag?

Correct Answer
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The iter method uses a yield statement to send each item to the calling for loop.

Correct Answer
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In the Bag class defined in the chapter, what is one of the purposes of the sourceCollection argument in the init method?

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