Question 1

What is one of the primary purposes of using inheritance?

Accepted Answer

A)  to customize an existing class 
B)  to create code redundancy 
C)  to avoid creating an __init__ method 
D)  to duplicate methods in an interface 
A)  to customize an existing class 
B)  to create code redundancy 
C)  to avoid creating an __init__ method 
D)  to duplicate methods in an interface

Question 2

A class that uses lists can use the methods defined in the AbstractCollection class.

Accepted Answer

A) True 
 B)False

Question 3

An instance variable that refers to an integer in two different related classes is a likely candidate to be moved to an abstract class.

Accepted Answer

A) True 
 B)False

Question 4

When creating the AbstractCollection class, which methods must you modify to provide default behavior?

Accepted Answer

A)  __len__ and count 
B)  __str__ and __eq__ 
C)  isEmpty and add 
D)  __init__ and __len__ 
A)  __len__ and count 
B)  __str__ and __eq__ 
C)  isEmpty and add 
D)  __init__ and __len__

Question 5

In which situation is a search unnecessary when performing the add method on a sorted bag?

Accepted Answer

A)  when the bag is full 
B)  when the new item is less than the last item 
C)  when the new item is greater than the first item 
D)  when the bag is empty 
A)  when the bag is full 
B)  when the new item is less than the last item 
C)  when the new item is greater than the first item 
D)  when the bag is empty

Question 6

A class that inherits properties from another class is called a superclass.

Accepted Answer

A) True 
 B)False

Question 7

When a programmer calls the next function on an iterator object, what happens if there is no current item in the sequence?

Accepted Answer

A)  the previous item is returned 
B)  the compiler generates an error 
C)  a StopIteration exception is raised 
D)  the None item is returned 
A)  the previous item is returned 
B)  the compiler generates an error 
C)  a StopIteration exception is raised 
D)  the None item is returned

Question 8

When implementing the __init__ method in the AbstractBag class, what task should you leave out because it is the responsibility of the subclasses?

Accepted Answer

A)  setting the self.size variable to 0 
B)  adding items from the source collection 
C)  initializing the self.items variable 
D)  checking if a source collection exists 
A)  setting the self.size variable to 0 
B)  adding items from the source collection 
C)  initializing the self.items variable 
D)  checking if a source collection exists

Question 9

How is creating a subclass of an existing class different from copying the code from the existing class to a new file?

Accepted Answer

A)  delete all the methods that don't have to change 
B)  you don't need an __init__ method 
C)  the name of the subclass is in parentheses of the class header 
D)  no methods need be created or modified 
A)  delete all the methods that don't have to change 
B)  you don't need an __init__ method 
C)  the name of the subclass is in parentheses of the class header 
D)  no methods need be created or modified

Question 10

Which of the following is true about abstract classes?

Accepted Answer

A)  they are the same as a class interface 
B)  the are always a subclass of a superclass 
C)  they are not normally instantiated in client applications 
D)  they are used as concrete classes by client applications 
A)  they are the same as a class interface 
B)  the are always a subclass of a superclass 
C)  they are not normally instantiated in client applications 
D)  they are used as concrete classes by client applications

What is one of the primary purposes of using inheritance?

A class that uses lists can use the methods defined in the AbstractCollection class.

An instance variable that refers to an integer in two different related classes is a likely candidate to be moved to an abstract class.

When creating the AbstractCollection class, which methods must you modify to provide default behavior?

In which situation is a search unnecessary when performing the add method on a sorted bag?

A class that inherits properties from another class is called a superclass.

When a programmer calls the next function on an iterator object, what happens if there is no current item in the sequence?

When implementing the init method in the AbstractBag class, what task should you leave out because it is the responsibility of the subclasses?

How is creating a subclass of an existing class different from copying the code from the existing class to a new file?

Which of the following is true about abstract classes?

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

What is one of the primary purposes of using inheritance?

A class that uses lists can use the methods defined in the AbstractCollection class.

An instance variable that refers to an integer in two different related classes is a likely candidate to be moved to an abstract class.

When creating the AbstractCollection class, which methods must you modify to provide default behavior?

In which situation is a search unnecessary when performing the add method on a sorted bag?

A class that inherits properties from another class is called a superclass.

When a programmer calls the next function on an iterator object, what happens if there is no current item in the sequence?

When implementing the __init__ method in the AbstractBag class, what task should you leave out because it is the responsibility of the subclasses?

How is creating a subclass of an existing class different from copying the code from the existing class to a new file?

Which of the following is true about abstract classes?

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

When implementing the init method in the AbstractBag class, what task should you leave out because it is the responsibility of the subclasses?