Which of the following patterns can be used for designing your class to add error checking such as not allowing a blank name for a bank account?

Question options:

	Describing the Position of an Object
	Modeling Objects with Distinct States
	Managing Properties of an Object
	Collecting Values
Question 4		0 / 1 point

Consider the following class which is used to represent a polygon consisting of an arbitrary number of (x, y) points:

class Polygon :

def __init__(self) :

self._x_points = []

self._y_points = []

Which of the following code segments is the correct implementation for the addPoint method that adds another point to the polygon?

Question options:

	def addPoint(self, x, y) : self._points.append(x, y)
	def addPoint(self, x, y) : self._x_points.append(x) self._y_points.append(y)
	def addPoint(self, x, y) : self._x_points = x self._y_points = y
	def addPoint(self, x, y) : self._x_points = [x] self._y_points = [y]
Question 6		0 / 1 point

Which of the following method headers represent a constructor for an Employee class?

Question options:

	def Employee(self) :
	def __init()__ :
	def __Employee__(self) :
	def __init__(self) :
Question 7		0 / 1 point

What part of the virtual machine is responsible for removing objects that are no longer referenced?

Question options:

	The allocator
	The garbage collector
	The recycler
	The regenerator
Question 11		0 / 1 point

Which of the following is NOT a true statement regarding object-oriented programming?

Question options:

	Object oriented programming views the program as a list of actions to perform.
	Object oriented programs usually contain different types of objects, each corresponding to a particular kind of complex data, real-world object or concept.
	Object oriented programming is a style where tasks are solved by collaborating objects.
	Object oriented programs are organized around "objects" rather than "actions" and "data" rather than "logic".
Question 13		0 / 1 point

Given the following code snippet, what statement completes the code to add several items to one grocery list:

def addItems(self, price, quantity, itemName) :

for i in range(quantity) :

________________________

def addItem(self, price, itemName) :

self._itemCount = self._ItemCount + 1

self._totalPrice = self._totalPrice + price

. . .

Question options:

	self.addItem(price, itemName)
	addItem(price, itemName)
	self._addItem(price, itemName)
	_addItem(price, itemName)
Question 17		0 / 1 point

What is the name of the method in the following code segment?

class Fruit :

def getColor(self) :

return self._color

Question options:

	_color
	Fruit
	getColor
	self
Question 18		0 / 1 point

Consider the following class:

class Counter :

def getValue(self) :

return self._value

def click(self) :

self._value = self._value + 1

def unClick(self) :

self._value = self._value - 1

def reset(self) :

self._value = 0

Which method creates a new instance variable?

Question options:

	click
	getValue
	reset
	unClick
Question 19		0 / 1 point

What change needs to be made in the following code segment so that lName will have a default value of "unknown"?

class PhoneNumber :

def __init__(self, lName, phone = "215-555-1212") :

self._name = lName

self._phone = phone

Question options:

	Replace self._name = lName with self._name = "unknown"
	Replace the lName parameter with lName = "unknown"
	Add name = "unknown" to the end of the constructor
	Add self._lName = "unknown" to the end of the constructor
Question 20		0 / 1 point

Suppose you have a class ShoppingList, with instance variables _quantity, _cost, and _itemName. How should you access these variables when writing code that is not contained within the ShoppingList class?

Question options:

	Directly access the instance variables by using the object and the instance variables' names.
	Use methods provided by the ShoppingList class.
	It is not possible to access the instance variables outside of the ShoppingList class.
	Use the self parameter followed by the instance variables' names.

Given the variable assignment sentence = "", what is the value of len(sentence)?

Question options:

	1
	-1
	an exception is raised
	0
Question 13		0 / 1 point

Recall the Cash Register class developed in the textbook. What is output by the following code segment?

from cashregister2 import CashRegister

reg1 = CashRegister()

reg2 = reg1

reg1.addItem(3.00)

reg1.addItem(5.00)

reg2.clear()

print(reg1.getCount())

Question options:

	0
	1
	2
	The program terminates with a runtime error
Question 16		0 / 1 point

What happens when an object is no longer referenced?

Question options:

	Nothing until the problem terminates
	The garbage collector removes the object
	The address is saved for future instances of the object
	Creates a None reference
Question 18		0 / 1 point

Which statement is NOT a description of encapsulation?

Question options:

	The act of hiding the implementation details
	A collection of methods through which the objects of the class can be manipulated
	Enables changes in the implementation without affecting users of a class
	Mechanism for restricting access to some of the object's components

Which of the follow code segments could be used to help test the getColor method from the Fruit class?

Question options:

	print(f.getColor()) print("Expected: Yellow")
	print("Yellow") print("Expected: Yellow")
	print(f.getColor()) print("Expected:", f.getColor())
	print("Yellow") print("Expected:", f.getColor())
Question 2		0 / 1 point

Which of the following patterns can be used for designing your class to update the balance of a bank account?

Question options:

	Keeping a total
	Counting events
	Collecting values
	Managing properties of an object
Question 3		0 / 1 point

Consider a class that represents a hardware device. The device can be in one of two states: Plugged in, or unplugged. Which of the following class definitions is best for this situation?

Question options:

	PLUGGED_IN = 0 UNPLUGGED = 1 class Device : def __init__(self) : . . .
	class Device : PLUGGED_IN = 0 UNPLUGGED = 1 def __init__(self) : . . .
	class Device : def __init__(self) : PLUGGED_IN = 0 UNPLUGGED = 1 . . .
	class Device : def __init__(self) : self.PLUGGED_IN = 0 self.UNPLUGGED = 1 . . .
Question 6		0 / 1 point

Which of the following is NOT a pattern used to help design the data representation of a class?

Question options:

	An instance variable for thte total is updated in methods that increase or decrease the total amount
	An object reference specifies the location of an object
	An object can collect other objects in a list
	To model a moving object, you need to store and update its position
Question 9		0 / 1 point

Consider the following class:

class Contact :

def __init__(self, name, phone="")

self._name = name

self._phone = phone

def getName(self) :

return self._name

def setName(self, new_name) :

self._name = new_name

def getPhone(self) :

return self._phone

def setPhone(self, new_phone) :

self._phone = new_phone

What is output by the following code segment?

p1 = Contact("Bob", "555-123-4567")

p2 = Contact("Joe", "555-000-0000")

p1.setName(p2.getName())

print(p1.getPhone())

Question options:

	Bob
	Joe
	555-000-0000
	555-123-4567
Question 10		0 / 1 point

How many constructors can be defined for each class?

Question options:

	At least one must be defined
	Only one may be defined
	At least one, but as many as needed
	At least one, but no more than five
Question 11		0 / 1 point

Which of the following is NOT true about instance methods for a class?

Question options:

	The object on which a method is applied is automatically passed to the self parameter variable of the method
	In a method, you access instance variables through the self parameter variable
	A class variable belongs to the class, not to any instance of the class
	The accessor and mutator methods are automatically called when an object is created
Question 13		0 / 1 point

What is the value of the variable bankAcct after the following code snippet is executed?

bankAcct = BankAccount("Fisher", 1000.00)

Question options:

	"Fisher", 1000.00
	A memory location
	"Fisher"
	1000.00
Question 18		0 / 1 point

Consider the following class:

class Pet:

____________________

def __init__(self, name):

self._name = name

Pet._lastID = Pet._lastID + 1

self._registrationID = Pet._lastID

What line of code should be placed in the blank to create a class variable that keeps track of the most recently used registration identifier?

Question options:

	_lastID = 0
	Pet.append(_lastID)
	Pet._lastID = 0
	self._lastID = 0

Attempt Score:	6 / 10 - D
	8 / 10 - B

Question 1

0 / 1 point

Before invoking a method on an object, what must be done first?

Question options:

Initialize all instance variables
Invoke the accessor and mutator methods
Create a public interface
Construct the object
Question 6		0 / 1 point

Which of the following questions should you ask yourself in order to determine if you have named your class properly?

Question options:

Does the class name contain 8 or fewer characters?
Is the class name a verb?
Can I visualize an object of the class?
Does the class name describe the tasks that this class will accomplish?
Question 8		0 / 1 point

Consider a class that represents a hardware device. The device can be in one of two states: Plugged in, or unplugged. Which of the following class definitions is best for this situation?

Question options:

PLUGGED_IN = 0 UNPLUGGED = 1 class Device : def __init__(self) : . . .
class Device : PLUGGED_IN = 0 UNPLUGGED = 1 def __init__(self) : . . .
class Device : def __init__(self) : PLUGGED_IN = 0 UNPLUGGED = 1 . . .
class Device : def __init__(self) : self.PLUGGED_IN = 0 self.UNPLUGGED = 1 . . .
Question 9		0 / 1 point

Which of the following is considered by the text to be the most important consideration when designing a class?

Question options:

Each class should represent an appropriate mathematical concept.
Each class should represent a single concept or object from the problem domain.
Each class should represent no more than three specific concepts.
Each class should represent multiple concepts only if they are closely related.
Question 16		0 / 1 point

Which name would be best for a private instance variable?

Question options:

_confidential
HIDDEN
private
Secret
Question 17		0 / 1 point

A method that queries an object for some information without changing it is known as a(n):

Question options:

Accessor
Function
Interface
Mutator
Question 19		0 / 1 point

Which of the following method headers represent a constructor for an Employee class?

Question options:

	def Employee(self) :
	def __init()__ :
	def __Employee__(self) :
	def __init__(self) :

Question 2

0 / 1 point

What items should be considered when creating the public interface?

Question options:

Method headers and method comments
Instance variables
Data and method bodies
Method implementations
Question 3		0 / 1 point

In the following example, which data is considered instance data?

You are assigned the task of writing a program that calculates payroll for a small company. To get started the program should do the following:

Add new employees including their first and last name and hourly wage

Ask for the number of hours worked

Calculate payroll (applying 1.5 for any hours greater than 40)

Print a report of all employees' salary for the week, total of all hours and total of all salaries

Question options:

	firstName, lastName, hoursWorked, hourlyWage
	firstName, lastName, hoursWorked, hourlyWage, payrollAmount
	firstName, lastName, hoursWorked, hourlyWage, totalHours, totalSalary
	firstName, lastName, hoursWorked, hourlyWage, payrollAmount, totalHours, totalSalary
Question 4		0 / 1 point

Which of the following is NOT a step carried out by a tester program?

Question options:

Construct one or more objects of the class
Invoke one or more methods
Print out one or more results
Identify syntax errors
Question 16		0 / 1 point

What change needs to be made in the following code segment so that lName will have a default value of "unknown"?

class PhoneNumber :

def __init__(self, lName, phone = "215-555-1212") :

self._name = lName

self._phone = phone

Question options:

Replace self._name = lName with self._name = "unknown"
Replace the lName parameter with lName = "unknown"
Add name = "unknown" to the end of the constructor
Add self._lName = "unknown" to the end of the constructor
Question 20		0 / 1 point

Which of the following is NOT a difference between methods and functions?

Question options:

A method is defined within a class. A function is defined outside of a class.
A function is defined within a class. A method is defined outside of a class.
The first parameter variable for a method is self. Functions do not have a self parameter variable.
	A method can access the instance variables of an object. A function cannot.

Question 1

0 / 1 point

Assume a class exists named Fruit. Which of the follow statements constructs an object of the Fruit class?

Question options:

def Fruit() :
class Fruit() :
x = Fruit()
x = Fruit.create()
Question 5		0 / 1 point

Assume that x is a variable containing an object reference. Which special method is invoked when the following statement executes?

print(x)

Question options:

__init__
__print__
__repr__
__str__
Question 6		0 / 1 point

How do you access instance variables in a method?

Question options:

Using the constructor
Using the public interface
Using a default value
Using the self reference
Question 7		0 / 1 point

Consider the following code segment:

class PhoneNumber :

def __init__(self, lName, phone = "215-555-1212") :

self._name = lName

self._phone = phone

def getName(self):

return self._name

def getPhone(self):

return self._phone

Jones = PhoneNumber("Jones")

print(Jones.getName(), Jones.getPhone())

What will be printed when it executes?

Question options:

	Jones 215-555-1212
	AttributeError: 'PhoneNumber' object has no attribute
	Jones
	Jones 000-000-0000
Question 8		0 / 1 point

What is the purpose of an object's instance variables?

Question options:

	Store the data required for executing its methods
	Store the data for all objects created by the same class
	To provide access to the data of an object
	To create variables with public visibility
Question 11		0 / 1 point

Consider the following code segment:

def mutate(self, newType) :

self._type = newType

self._mutations = self._mutations + 1

What is the name of the local variable in it:

Question options:

mutate
_mutations
newType
_type
Question 13		0 / 1 point

When is a constructor invoked?

Question options:

	When an object is created
	When instance data is modified
	When a method is invoked
	When multiple arguments are required to create an object
Question 15		0 / 1 point

Which of the following statements determines if x currently refers to an object containing an integer?

Question options:

if int(x) :
if x == int :
if x is int :
if isinstance(x, int) :
Question 20		0 / 1 point

Assume a class exists named Person. Which of the follow statements constructs an object of the Person class?

Question options:

	bob = __init__(Person)
	bob = Person.__init__()
	bob = Person
	bob = Person()