Deck 2: An Overview of Collections

Question 1

The use of collections is a Python programming requirement, but they are not very useful for working with real-world objects.

Answer 1

False

Question 2

A set is a built-in Python collection type.

Answer 2

True

Question 3

The pop method is used to add items to a Python list.

Answer 3

False

Question 4

Use the & operator to concatenate two collections.

Question 5

A line of customers waiting to get into a movie is an example of a hierarchical collection.

Question 6

To traverse a collection's items, use the for loop.

Question 7

A search operation is usually more efficient on a sorted collection than on an unsorted collection.

Question 8

When a shallow copy of a collection is made, only references to the items in the new collection are copied.

Question 9

The map, filter, and reduce functions can only be used on list collections.

Question 10

Graph collections are organized in a parent/children relationship.

Question 11

If you clone an object using the = operator (as in myList=list(yourList) ), the is operator returns True while the == operator returns False.

Question 12

When collections share mutable items, a deep copy using a for loop should be used to explicitly clone items before adding them to a new collection.

Question 13

A sorted collection must be in a linear structure, ordered by position.

Question 14

To determine equality of two collections, use the == operator.

Question 15

A tuple is an immutable collection type.

Question 16

A collection contains at least one item.

Question 17

All collections are also iterable objects.

Question 18

To be considered equal, two lists must have the same length and the same items in each position, whereas the same sets must simply contain exactly the same items, but in no particular order.

Question 19

When using a for loop to iterate over a list, the items are visited in no particular order.

Question 20

By default, items in a sorted collection are visited in descending order when using a for loop iterator.

Question 21

Which real-world item best represents a linear collection?

A) file system
B) organizational chart
C) stack of bricks
D) table of contents

Question 22

Python includes two implementations of lists: arrays and linked lists.

Question 23

Which type of collection is ordered by position?

A) linear
B) hierarchical
C) graph
D) sorted

Question 24

What is the value of c after the following code executes?
A = [ 10, 20, 30 ]
B = [ 40, 50, 60 ]
C = a + b

A) [ 50, 70, 90 ]
B) {[ 10, 20, 30 ], [ 40, 50, 60 ]}
C) [ 10, 20, 30, 40, 50, 60 ]
D) ([ 10, 40 ], [ 20, 50 ], [ 30, 60 ])

Question 25

In computer science, collections are also called objective data types (ODTs).

Question 26

Which statement is true about a sorted collection?

A) must be ordered by position
B) they need not be linear
C) searching is inefficient
D) a box of donuts is an example

Question 27

Which of the following is true about Python collections?

A) most can be heterogeneous
B) all are homogeneous
C) they are typically static
D) all are immutable object types

Question 28

What is the value of aList after the following code is executed?
AList = [ 10, 20, 30 ]
AList.pop()

A) [ 10, 20, 30 ]
B) [ 10,20 ]
C) [ ]
D) [ 20, 30 ]

Question 29

In Python, modules and methods are the smallest units of abstraction, classes are the next in size, and functions are the largest.

Question 30

In computer science, abstraction is used for ignoring or hiding details that are nonessential.

Question 31

What is the value of myObject after the following code executes?
YourObject = "Hi"
MyObject = tuple(yourObject)

A) ('H', 'i')
B) [ "H", "i" ]
C) (Hi)
D) ("Hi")

Question 32

Which of the following is a special case of type conversion, where the two collections are of the same type?

A) replacing
B) copying
C) duplicating
D) cloning

Question 33

Which of the following is an unordered collection?

A) string
B) stack
C) dictionary
D) queue

Question 34

Without abstraction, you would need to consider all aspects of a software system simultaneously.

Question 35

Which real-world item best represents a hierarchical collection?

A) a queue of customers
B) wiring diagrams
C) a box of legos
D) a family tree

Question 36

Which Python function returns the total number of items in a collection?

A) sizeof
B) len
C) count
D) total

Question 37

Which object type is immutable?

A) list
B) set
C) dict
D) tuple

Question 38

What is the value of aList after the following code is executed?
AList = [ 1, 2, 3 ]
AList.remove(2)

A) [ 1, 2 ]
B) [ 1, 3 ]
C) [ 3 ]
D) [ 1 ]

Question 39

What is a group of zero or more items that can be operated on as a unit?

A) grouping
B) collection
C) array
D) organization

Question 40

Which operator can you use to test for item membership in a collection?

A) in
B) ==
C) @
D) is

Question 41

In what order are dictionary items visited during an iteration?

A) the order in which they were added
B) ascending, by key value
C) descending, by item value
D) no particular order

Question 42

What can a programmer do to prevent side effects from cloning mutable objects?

A) create a deep copy using a for loop
B) create a shallow copy using a type conversion
C) create a deep copy using a type conversion
D) use the assignment operator in stead of a type conversion

Question 43

When a for loop is used to iterate over a collection, which statement is true?

A) list items are visited from last to first
B) items in a list are visited in a random order
C) items in a sorted collection are visited in ascending order
D) items in a dictionary are visited in descending order

Question 44

Which operator is used to obtain a string representation of a collection?

A) len
B) char
C) str
D) in

Question 45

Which of the following lists Python units of abstraction from smallest to largest?

A) classes, methods, functions, modules
B) functions, methods, classes, modules
C) modules, functions, methods, classes
D) modules, classes, methods, function

Question 46

In which type of collection does each item have many predecessors and successors, called neighbors?

A) linear
B) hierarchical
C) graph
D) unordered

Question 47

What is the value of newObject after the following code executes?
NewObject = tuple("Hello")

A) ('H', 'e', 'l', 'l', 'o')
B) [ "Hello" ]
C) ("Hello")
D) [ 'H', 'e', 'l', 'l', 'o' ]

Question 48

What is the value of newList after the following code executes?
NewList = list(range(9, 0, -3))

A) [ 8, 5, 2 ]
B) [ 9, 6, 3, 0 ]
C) [ 9, 6, 3 ]
D) [ ]

Question 49

What is the value of r after the following code executes?
MySet = {2, 3, 5, 7, 11}
YourSet = {5, 7, 2, 11, 3}
R = yourSet == mySet

A) {5, 7, 2, 11, 3}
B) True
C) False
D) 0

Question 50

What is the value of r after the following code executes?
MyList = [ 2, 3, 5, 7, 11 ]
YourList = list(myList)
R = yourList is myList

A) [ 2, 3, 5, 7, 11 ]
B) True
C) None
D) False