Chapter 10 Classes and Object-Oriented Programming

Question 1

Which method is automatically called when you pass an object as an argument to the print function?

a. __init__
b. __obj__
c. __str__
d. __state__

Answer 1

__str__

Chapter 10 Q

Question 2

Which attributes belong to a specific instance of a class?

a. instance
b. object
c. data
d. self

Answer 2

instance

Chapter 10 Q (page# 510)

Question 3

What type of programming contains class definitions?

a. top-down
b. modular
c. procedural
d. object-oriented

Answer 3

object-oriented

Chapter 10 Q

Question 4

Procedures operate on data items that are separate from the procedures.
True or False?

Answer 4

True

Chapter 10 Q

Question 5

A class can be thought of as a blueprint that can be used to create an object.
True or False?

Answer 5

True

Chapter 10 Q

Question 6

Which of the first line needed when creating a class named Worker?

a. def__init__(self):
b. import random
c. class Worker:
d. def worker_pay(self):

Answer 6

class Worker:

Chapter 10 Q (page# 494)

To create a class, you write a class definition. A class definition is a set of statements that define a class’s methods and data attributes.

Question 7

The self parameter is required in every method of a class.

True or False?

Answer 7

True

Chapter 10 Q

Question 8

A mutator method has no control over the way that a class’s data attributes are notified.
True or False?

Answer 8

False

Chapter 10 Q (page# 515)
A method that stores a value in a data attribute or changes the value of a data attribute in some other way is known as a mutator method.
Mutator methods "can control" the way that a class's data attributes are notified.
When a code outside the class needs to change the value of an object's data attribute, it typically calls a mutator and passes the new value as an argument.

nt.

Question 9

Which methods is automatically executed when an instance of a class is created in memory?

a. __obj__
b. __str__
c. __state__
d. __init__

Answer 9

__init__

Chapter 10 Q (page# 496)

Python class have a special method named _ _init_ _, which is automatically executed when an instance of the class is created in memory.  
The _ _init_ _ method is commonly known as an initializer method because it initializes the object's data attributes.

Question 10

When an object is passed as an argument, ___ is passed into the parameter variable.

a. Objects cannot be passed as arguments.
b. a copy of the object
c. a reference to the object
d. a reference to the object’s state.

Answer 10

a reference to the object

Chapter 10 Q (page# 518)

When you pass an object as an argument, the thing that is passed into the parameter variable is a reference to that object. As a result, the function or method that receives the object as an argument has access to the actual object.