Question 1

Every Python object is an instance of a(n):
A) data model.
B) class.
C) method.
D) algorithm.

Accepted Answer

In Python, every object is an instance of a class, which defines its structure and behavior.

Question 2

The details about what an object can do are called:
A) methods.
B) instance data.
C) models.
D) data types.

Accepted Answer

Methods define the behaviors or actions that an object can perform in object-oriented programming.

Question 3

Which of the following is one of Python's collection classes?
A) int
B) float
C) bool
D) str

Accepted Answer

The 'str' class in Python is used for handling strings, which are sequences of characters, making it a collection class.

Question 4

The ____ operator is used to invoke a method of an object.
A) dot
B) equals
C) dash
D) star

Accepted Answer

The dot operator (.) is used to invoke a method of an object.

Question 5

Case Study 1:
>>> count = 1
>>> count = count + 1
>>> count
2
>>> count = count.__add__(1)
>>> count
3
>>>
>>> mylist.__getitem__(1)
66
-Refer to the session in the accompanying Case Study 1. What is the equivalent of the + operator?
A) __getItem__
B) __add__
C) ++
D) =

Accepted Answer

The + operator is equivalent to the __add__ method.

Question 6

Case Study 1:
>>> count = 1
>>> count = count + 1
>>> count
2
>>> count = count.__add__(1)
>>> count
3
>>>
>>> mylist.__getitem__(1)
66
-Refer to the session in the accompanying Case Study 1. What is the equivalent of the __getItem__ operator?
A) []
B) __add__
C) +
D) =

Accepted Answer

[] is the equivalent of the __getitem__ operator.

Question 7

What keyword defines a class in Python?
A) get
B) construct
C) def
D) class

Accepted Answer

The keyword "class" is used in Python to define a class.

Question 8

In Python, the constructor is always named:
A) __get__.
B) __init__.
C) constructor.
D) class.

Accepted Answer

The constructor in Python is always named __init__.

Question 9

In a Python class, ____ refers to the object for which the method was called.
A) self
B) init
C) obj
D) class

Accepted Answer

In Python, 'self' is a reference to the current instance of the class, used to access variables and methods associated with the object for which the method was called.

Question 10

An accessor method is most likely to be used to implement:
A) mutator methods.
B) information hiding.
C) a constructor.
D) the dot operator.

Accepted Answer

Accessor methods are used to implement information hiding, which is the practice of hiding the implementation details of a class from its users. This is done by making the data members of the class private and providing public accessor methods to access the data.

Question 11

The print method invokes the ____ method of a class.
A) __print__
B) __str__
C) print
D) out

Accepted Answer

The print method in Python invokes the __str__ method of a class to get a string representation of an object for printing.

Question 12

____ objects store method names that refer to method definitions that are implemented by the class.
A) Mutator
B) Instance
C) Class definition
D) Self

Accepted Answer

Class definition objects store method names that refer to method definitions that are implemented by the class.

Question 13

____ methods change an object in some way.
A) Accessor
B) Instance
C) Print
D) Mutator

Accepted Answer

The answer of ____ methods change an object in some...

Question 14

Preceding an instance variable name by two underscores____ the instance variable.
A) exposes
B) hides
C) mutates
D) accesses

Accepted Answer

Preceding an instance variable name by two underscores (__) hides the instance variable.

Question 15

Case Study 2:
1. def createSSandAnimate():
2. ss = SolarSystem(2, 2)
3.
4. sun = Sun("SUN", 5000, 1000, 5800)
5. ss.addSun(sun)
6.
7. m = Planet("MERCURY", 19.5, 1000, .25, 0, 2, "blue")
8. ss.addPlanet(m)
9.
10. m = Planet("EARTH", 47.5, 5000, 0.3, 0, 2.0, "green")
11. ss.addPlanet(m)
12.
13. m = Planet("MARS", 50, 9000, 0.5, 0, 1.63, "red")
14. ss.addPlanet(m)
15.
16. m = Planet("JUPITER", 100, 49000, 0.7, 0, 1, "black")
17. ss.addPlanet(m)
18.
19. numTimePeriods = 2000
20. for aMove in range(numTimePeriods):
21. ss.movePlanets()
22.
23. ss.freeze()
24.
-Refer to the session in the accompanying Case Study 2. Which line(s) perform the actual work of the animation?
A) 4-5
B) 10-11
C) 16-17
D) 19-21

Accepted Answer

Lines 19-21 perform the actual work of the animation by iterating over a range of time periods and moving the planets within the solar system.

Question 16

Algorithms describe the solution to a problem in terms of the data needed to represent the problem instance and a set of steps necessary to produce the intended result.

Accepted Answer

Algorithms are step-by-step procedures or formulas for solving problems, which include the data required and the sequence of operations to achieve the desired outcome.

Question 17

To create an instance of a class, call the __init__ method directly.

Accepted Answer

The __init__ method is called automatically when the class name is followed by ().

Question 18

Each object from a particular class has the same instance variables, but the values of those variables are different, therefore allowing the object to "behave" differently when asked to perform methods.

Accepted Answer

Instance variables are unique to each object, allowing them to store different values and thus enabling objects to behave differently when methods are called.

Question 19

The __class__ method is used to provide each object with a reference to the class definition object to which it belongs.

Accepted Answer

__class__ is an instance variable reference to the class definition.

Question 20

The turtle module only allows one turtle to exist simultaneously in the same window.

Accepted Answer

Multiple turtles can exist simultaneously.

Quiz 10: Astronomy: Creating Classes, Writing Constructors, Accessors, Mutators and Special Methods

Every Python object is an instance of a(n) :

The details about what an object can do are called:

Which of the following is one of Python's collection classes?

The ____ operator is used to invoke a method of an object.

Case Study 1: >>> count = 1 >>> count = count + 1 >>> count 2 >>> count = count.add(1) >>> count 3 >>> >>> mylist.getitem(1) 66 -Refer to the session in the accompanying Case Study 1. What is the equivalent of the + operator?

Case Study 1: >>> count = 1 >>> count = count + 1 >>> count 2 >>> count = count.add(1) >>> count 3 >>> >>> mylist.getitem(1) 66 -Refer to the session in the accompanying Case Study 1. What is the equivalent of the getItem operator?

What keyword defines a class in Python?

In Python, the constructor is always named:

In a Python class, ____ refers to the object for which the method was called.

An accessor method is most likely to be used to implement:

The print method invokes the ____ method of a class.

____ objects store method names that refer to method definitions that are implemented by the class.

____ methods change an object in some way.

Preceding an instance variable name by two underscores____ the instance variable.

Algorithms describe the solution to a problem in terms of the data needed to represent the problem instance and a set of steps necessary to produce the intended result.

To create an instance of a class, call the init method directly.

Each object from a particular class has the same instance variables, but the values of those variables are different, therefore allowing the object to "behave" differently when asked to perform methods.

The class method is used to provide each object with a reference to the class definition object to which it belongs.

The turtle module only allows one turtle to exist simultaneously in the same window.

Quiz 10: Astronomy: Creating Classes, Writing Constructors, Accessors, Mutators and Special Methods

Every Python object is an instance of a(n) :

The details about what an object can do are called:

Which of the following is one of Python's collection classes?

The ____ operator is used to invoke a method of an object.

Case Study 1: >>> count = 1 >>> count = count + 1 >>> count 2 >>> count = count.__add__(1) >>> count 3 >>> >>> mylist.__getitem__(1) 66 -Refer to the session in the accompanying Case Study 1. What is the equivalent of the + operator?

Case Study 1: >>> count = 1 >>> count = count + 1 >>> count 2 >>> count = count.__add__(1) >>> count 3 >>> >>> mylist.__getitem__(1) 66 -Refer to the session in the accompanying Case Study 1. What is the equivalent of the __getItem__ operator?

What keyword defines a class in Python?

In Python, the constructor is always named:

In a Python class, ____ refers to the object for which the method was called.

An accessor method is most likely to be used to implement:

The print method invokes the ____ method of a class.

____ objects store method names that refer to method definitions that are implemented by the class.

____ methods change an object in some way.

Preceding an instance variable name by two underscores____ the instance variable.

Algorithms describe the solution to a problem in terms of the data needed to represent the problem instance and a set of steps necessary to produce the intended result.

To create an instance of a class, call the __init__ method directly.

Each object from a particular class has the same instance variables, but the values of those variables are different, therefore allowing the object to "behave" differently when asked to perform methods.

The __class__ method is used to provide each object with a reference to the class definition object to which it belongs.

The turtle module only allows one turtle to exist simultaneously in the same window.

Case Study 1: >>> count = 1 >>> count = count + 1 >>> count 2 >>> count = count.add(1) >>> count 3 >>> >>> mylist.getitem(1) 66 -Refer to the session in the accompanying Case Study 1. What is the equivalent of the + operator?

Case Study 1: >>> count = 1 >>> count = count + 1 >>> count 2 >>> count = count.add(1) >>> count 3 >>> >>> mylist.getitem(1) 66 -Refer to the session in the accompanying Case Study 1. What is the equivalent of the getItem operator?

To create an instance of a class, call the init method directly.

The class method is used to provide each object with a reference to the class definition object to which it belongs.