Question 1

Which operator, when used with two bags, causes Python to run the __add__ method?

Accepted Answer

A)  = 
B)  * 
C)  + 
D)  % 
A)  = 
B)  * 
C)  + 
D)  % C

Question 2

The following code is part of the add method in the ArraySortedBag class. What is the missing code? if self.isEmpty() or item >= self.items[len(self) - 1]:

Accepted Answer

A)  add.self(item) 
B)  ArrayBag.add(item) 
C)  ArrayBag.add(self, item) 
D)  add.ArrayBag(self, item) 
A)  add.self(item) 
B)  ArrayBag.add(item) 
C)  ArrayBag.add(self, item) 
D)  add.ArrayBag(self, item) C

Question 3

A concrete class is often a subclass of an abstract class and is used to create objects in client applications.

Accepted Answer

A) True 
 B)False  True

Question 4

When a programmer calls the iter function on a collection, the collection's iterator object is returned.

Accepted Answer

A) True 
 B)False

Question 5

To begin creating a subclass, copy the parent class's file and delete the methods that will not change.

Accepted Answer

A) True 
 B)False

Question 6

To ensure that inheritance occurs, you need to place the name of the subclass in parentheses of the class header.

Accepted Answer

A) True 
 B)False

Question 7

The __eq__ method in the AbstractCollection class compares pairs of items in two collections.

Accepted Answer

A) True 
 B)False

Question 8

In the following code for the __add__ method in the ArraySortedBag class, what is the missing code? def __add__(self, other):
Result = ArraySortedBag(self)
For item in other:

Return result

Accepted Answer

A)  result = result + 1 
B)  item.add(result) 
C)  result.add(item) 
D)  add.item(result) 
A)  result = result + 1 
B)  item.add(result) 
C)  result.add(item) 
D)  add.item(result)

Question 9

The implementations of the __str__ and __eq__ methods in the AbstractCollection class can be used in both unordered and linear collections.

Accepted Answer

A) True 
 B)False

Question 10

Programming languages such as Java include a collection framework more extensive than that of Python.

Accepted Answer

A) True 
 B)False

Question 11

An instance variable is considered redundant if two different classes use it and it refers to a different type of data structure in each class.

Accepted Answer

A) True 
 B)False

Question 12

In the following code for the ArrayBag class __contains__ method, what is the missing code?
Def __contains__(self, item):
Left = 0
Right = len(self) - 1
While left  item:
Right = midPoint - 1
Else:

Return False

Accepted Answer

A)  right = midPoint + 1 
B)  left = midPoint - 1 
C)  right = left + 1 
D)  left = midPoint + 1 
A)  right = midPoint + 1 
B)  left = midPoint - 1 
C)  right = left + 1 
D)  left = midPoint + 1

Question 13

The easiest way to take advantage of inheritance is to use it to customize an existing class.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is true about the sorted bag collection compared to the regular bag collection?

Accepted Answer

A)  the add method is identical in both 
B)  the __init__ method is identical in both 
C)  the sorted bag's in operator runs in linear time 
D)  the items in a sorted bag must be of the same type 
A)  the add method is identical in both 
B)  the __init__ method is identical in both 
C)  the sorted bag's in operator runs in linear time 
D)  the items in a sorted bag must be of the same type

Question 15

Which of the following is NOT a step in using inheritance to create a subclass?

Accepted Answer

A)  delete the methods that do not change 
B)  duplicate redundant instance variables 
C)  modify the code for methods that change 
D)  add any new methods 
A)  delete the methods that do not change 
B)  duplicate redundant instance variables 
C)  modify the code for methods that change 
D)  add any new methods

Question 16

When you finish writing the abstract class, what must the subclasses do to use it?

Accepted Answer

A)  reference the abstract class in their __init__ method. 
B)  copy the code to the subclass file 
C)  nothing, the abstract class is automatically included in the subclass 
D)  import the abstract class 
A)  reference the abstract class in their __init__ method. 
B)  copy the code to the subclass file 
C)  nothing, the abstract class is automatically included in the subclass 
D)  import the abstract class

Question 17

To distinguish a method in the parent class from a method with the same name in a subclass, prefix the method name with self .

Accepted Answer

A) True 
 B)False

Question 18

What method is called when the in operator is used on a sorted bag?

Accepted Answer

A)  __iter__ 
B)  __contains__ 
C)  __init__ 
D)  add 
A)  __iter__ 
B)  __contains__ 
C)  __init__ 
D)  add

Question 19

In the case of the AbstractCollection class, which of the following methods should NOT be included in this class?

Accepted Answer

A)  add 
B)  isEmpty 
C)  __len__ 
D)  count 
A)  add 
B)  isEmpty 
C)  __len__ 
D)  count

Question 20

When a class is customized using inheritance, the two classes should have a similar interface.

Accepted Answer

A) True 
 B)False

Which operator, when used with two bags, causes Python to run the add method?

The following code is part of the add method in the ArraySortedBag class. What is the missing code? if self.isEmpty() or item >= self.items[len(self) - 1]: < missing code >

A concrete class is often a subclass of an abstract class and is used to create objects in client applications.

When a programmer calls the iter function on a collection, the collection's iterator object is returned.

To begin creating a subclass, copy the parent class's file and delete the methods that will not change.

To ensure that inheritance occurs, you need to place the name of the subclass in parentheses of the class header.

The eq method in the AbstractCollection class compares pairs of items in two collections.

In the following code for the add method in the ArraySortedBag class, what is the missing code? def add(self, other): Result = ArraySortedBag(self) For item in other: < missing code > Return result

The implementations of the str and eq methods in the AbstractCollection class can be used in both unordered and linear collections.

Programming languages such as Java include a collection framework more extensive than that of Python.

An instance variable is considered redundant if two different classes use it and it refers to a different type of data structure in each class.

The easiest way to take advantage of inheritance is to use it to customize an existing class.

Which of the following is true about the sorted bag collection compared to the regular bag collection?

Which of the following is NOT a step in using inheritance to create a subclass?

When you finish writing the abstract class, what must the subclasses do to use it?

To distinguish a method in the parent class from a method with the same name in a subclass, prefix the method name with self .

What method is called when the in operator is used on a sorted bag?

In the case of the AbstractCollection class, which of the following methods should NOT be included in this class?

When a class is customized using inheritance, the two classes should have a similar interface.

Basic Python Programming

An Overview of Collections

Searching, Sorting, and Complexity Analysis

Arrays and Linked Structures

Interfaces, Implementations, and Polymorphism

Stacks

Queues

Lists

Trees

Sets and Dictionaries

Graphs

Filters

Exam 6: Inheritance and Abstract Classes

Which operator, when used with two bags, causes Python to run the __add__ method?

The following code is part of the add method in the ArraySortedBag class. What is the missing code? if self.isEmpty() or item >= self.items[len(self) - 1]: < missing code >

A concrete class is often a subclass of an abstract class and is used to create objects in client applications.

When a programmer calls the iter function on a collection, the collection's iterator object is returned.

To begin creating a subclass, copy the parent class's file and delete the methods that will not change.

To ensure that inheritance occurs, you need to place the name of the subclass in parentheses of the class header.

The __eq__ method in the AbstractCollection class compares pairs of items in two collections.

In the following code for the __add__ method in the ArraySortedBag class, what is the missing code? def __add__(self, other): Result = ArraySortedBag(self) For item in other: < missing code > Return result

The implementations of the __str__ and __eq__ methods in the AbstractCollection class can be used in both unordered and linear collections.

Programming languages such as Java include a collection framework more extensive than that of Python.

An instance variable is considered redundant if two different classes use it and it refers to a different type of data structure in each class.

The easiest way to take advantage of inheritance is to use it to customize an existing class.

Which of the following is true about the sorted bag collection compared to the regular bag collection?

Which of the following is NOT a step in using inheritance to create a subclass?

When you finish writing the abstract class, what must the subclasses do to use it?

To distinguish a method in the parent class from a method with the same name in a subclass, prefix the method name with self .

What method is called when the in operator is used on a sorted bag?

In the case of the AbstractCollection class, which of the following methods should NOT be included in this class?

When a class is customized using inheritance, the two classes should have a similar interface.

Basic Python Programming

An Overview of Collections

Searching, Sorting, and Complexity Analysis

Arrays and Linked Structures

Interfaces, Implementations, and Polymorphism

Stacks

Queues

Lists

Trees

Sets and Dictionaries

Graphs

Filters

Which operator, when used with two bags, causes Python to run the add method?

The eq method in the AbstractCollection class compares pairs of items in two collections.

In the following code for the add method in the ArraySortedBag class, what is the missing code? def add(self, other): Result = ArraySortedBag(self) For item in other: < missing code > Return result

The implementations of the str and eq methods in the AbstractCollection class can be used in both unordered and linear collections.