Deck 6: Objects and Their Use

Question 1

An object consists of functions, called methods, that operate on the data contained within the object.

Answer 1

True

Question 2

All values in Python are represented as objects.

Answer 2

True

Question 3

Objects consist of three fundamental parts: a set of attributes, a set of non-value returning functions called methods, and a set of value-returning functions.

Answer 3

False

Question 4

The dot operator is used to select a member of an object.

Question 5

Two objects of the same type have the same set of methods.

Question 6

Two objects of the same type store the same set of values, but are represented by instance variables with different identifiers (names) in each.

Question 7

A list in Python is a collection of objects (values), but the list itself is not an object.

Question 8

A list in Python contains a collection of values, in which each value is an object, but the list itself is not an object.

Question 9

There may be more than on name associated with a given object stored in memory.

Question 10

Built-in function id can be used to obtain the reference value of any object in Python.

Question 11

Built-in function id return a unique value for all objects in Python.

Question 12

When one variable is assigned to another, it is the dereferenced value that is assigned, not the reference value.

Question 13

To deallocate a memory location is to mark it as "no longer needed" so that the executing program does not attempt to use it.

Question 14

Garbage collection it a process that automatically determines what parts of memory can be deallocated during the execution of a program.

Question 15

When one variable is assigned to another variable referencing a list, a second copy of the list is automatically created.

Question 16

Python provides a list contructor that can be used to create a deep copy of a list.

Question 17

In Python, an object has certain attributes and behaviors, implemented as

A) functions and methods
B) instance variables and methods
C) instance variables and values
D) lists and methods
E) lists and values

Question 18

For variable n with the value 10,

A) n provides the reference value, and id(n) provides the dereferenced value 10
B) n provides the value 10 and id(n) provides the value of the location of identifiers n in memory
C) n provides the value 10 and id(n) provides the location of the value 10 in memory
D) n and id(n) are two ways of obtaining the derefereneced value of 10
E) n and id(n) are two ways of obtaining the reference value of 10

Question 19

After the following series of assignments are performed,
List1 = [1, 2, 3, 4]
List2 = list1
List1 = [5, 6, 7, 8]

A) list1 will no longer be referencing a list
B) list2 will no longer be referencing a list
C) variable list2 will be referencing the list [5, 6, 7, 8]
D) the list [1, 2, 3, 4] will no longer be referenced by variable list1 or list2
E) list1 will reference the list [5, 6, 7, 8] and list2 will reference the list [5, 6, 7, 8]

Question 20

After the following series of assignments are performed,
List1 = [1, 2, 3, 4]
List2 = list(list1)
List1 = [5, 6, 7, 8]

A) list1 will no longer be referencing a list
B) list2 will no longer be referencing a list
C) variable list2 will be referencing the list [5, 6, 7, 8]
D) the list [1, 2, 3, 4] will no longer be referenced by variable list1 or list2
E) list1 will reference the list [5, 6, 7, 8] and list2 will reference the list [5, 6, 7, 8]

Question 21

After the following series of assignments are performed,
List1 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
List2 = list(list1)
List2[0][0] = 10

A) list1[0][0] will equal 1, and list2[0][0] will equal 10
B) list1[0][0] will equal 10, and list2[0][0] will equal 1
C) both list1[0][0] and list2[0][0] will equal 10
D) an error will result
E) id(list1) will equal id(list2)

Question 22

After the following series of assignments are performed,
List1 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
List2 = list(list1)
List2[0][0] = 10

A) list1[0][0] will equal 1, and list2[0][0] will equal 10
B) list1[0][0] will equal 10, and list2[0][0] will equal 1
C) both list1[0][0] and list2[0][0] will equal 10
D) an error will result
E) id(list1) will equal id(list2)

Question 23

Match the following:

-behavior

A) instance variable
B) method
C) dot operator
D) reference
E) garbage collection

Question 24

Match the following:

-memory deallocation

A) instance variable
B) method
C) dot operator
D) reference
E) garbage collection

Question 25

Match the following:

-memory location

A) instance variable
B) method
C) dot operator
D) reference
E) garbage collection

Question 26

Match the following:

-attribute

A) instance variable
B) method
C) dot operator
D) reference
E) garbage collection

Question 27

Match the following:

-selection

A) instance variable
B) method
C) dot operator
D) reference
E) garbage collection

Question 28

An object contains a set of __________________ and a set of ____________.

Question 29

The _____________ is used to access a member of an object.

Question 30

There are two values associated with an object, its ___________________ value and its_____________________ value.

Question 31

Build in function _______ can be used in Python to determine if two variables reference the same object in memory.

Question 32

There are two types of creating a copy of an object, a ___________ copy and a _____________ copy..

Question 33

Suppose that variable k is assigned to a list object that contains a method called numZeros that returns the number of 0 values in the list. Give the proper syntax for calling method numZeros on variable k.

Question 34

Suppose that list1 is assigned to a list of integers. Given the proper code so that a complete copy of list1 is assigned to variable list2.

Question 35

Suppose that list1 is assigned to a list of tuples. Given the proper code so that a complete copy of list1 is assigned to variable list2.

Question 36

Give Python code to determine if two lists, list1 and list2, reference two completely different list objects or not.

Question 37

Suppose that list1 and list2 each reference the same list object in memory. Give a set of instruction that would cause the original list reference to be automatically garbage collected.

Question 38

Examine the following Python code:
list1 = [1, 2, 3, 4, 5]
list2 = nList
list1.append(6)
list2.append(7)
for i in list1:
print(i, end = '')
print()
for i in list2:
print(i, end = '')
What will this code output? Explain.

Question 39

The use of turtle graphics in Python requires that the turtle module be imported.

Question 40

A location in the turtle graphics window is indicated by an x and y coordinate value relative to the center of the screen in inches.

Question 41

For a turtle screen size of 600 x 800, the coordinates of the top left corner are (-300, 400).

Question 42

The can be created numerous turtle objects in a given program.

Question 43

When a turtle is moved to a new position using the setposition method, a line is drawn from its current location to the new location if the turtle is set to be shown (by use of the showturtle method.)

Question 44

What would the result of the turtle.setup(400, 500) be in turtle graphics?

A) A turtle screen of 400 pixels wide and 500 pixels high would be created.
B) A turtle screen of 500 pixels wide and 400 pixels high would be created.
C) A turtle screen of -400 to 400 pixels wide and -500 to 500 pixels high would be created.
D) A turtle screen of -500 to 500 pixels wide and -400 to 400 pixels high would be created.
E) None of the above

Question 45

Which of the following returns the reference to the "default" turtle created as a result of a call to the setup method?

A) window.turtle()
B) window.getTurtle()
C) setup.getTurtle()
D) setup.getturtle()
E) turtle.getturtle()

Question 46

Which of the following is NOT an example of relative positioning?

A) the_turtle.setposition(100, 100)
B) the_turtle.forward(100)
C) the_turtle.left(90)
D)  the_turtle.penup()
E)  the_turtle.hideturtle()

Question 47

The __________ method of turtle graphics in Python is used to create a turtle screen of a specific size.

Question 48

The instruction to get the reference to the "default" turtle in turtle graphics is __________________.

Question 49

The instruction to set the position of a turtle object to the center of the screen is __________________.

Question 50

The instruction to determine the current position of a turtle object is __________________.

Question 51

The instruction to create a new turtle object is ____________________________.

Question 52

Give Python code to create a square of size 100 x 100 such that its bottom left corner is positioned at screen location (0, 0). Use absolute positioning to do this. (Assume that the turtle screen has been set up, and that there is a turtle named the_turtle to make use of.)

Question 53

Give Python code to create a square of size 100 x 100 such that its bottom left corner is positioned at screen location (0, 0). Use relative positioning to do this. (Assume that the turtle screen has been set up, and that there is a turtle named the_turtle to make use of.)

Question 54

Give Python code using turtle graphics that draws three squares, one inside of the other as shown below.