Deck 9: Dictionaries and Sets

Question 1

You would typically use a for loop to iterate over the elements in a set.

Answer 1

True

Question 2

Which method would you use to get the value associated with a specific key and remove that key-value pair from the dictionary?

A) list
B) items
C) pop
D) popitem

Answer 2

C

Question 3

What will be the result of the following code?
Ages = {'Aaron' : 6,'Kelly' : 3,'Abigail' : 1 }
Value = ages['Brianna']

A) False
B) -1
C) 0
D) KeyError

Answer 3

D

Question 4

Sets are immutable.

Question 5

Sets are created using curly braces { }.

Question 6

Which would you use to get the number of elements in a dictionary?

A) size
B) length
C) len
D) sizeof

Question 7

If you try to retrieve a value from a dictionary using a nonexistent key,a KeyError exception is raised.

Question 8

The elements in a dictionary are stored in ascending order,by the keys of the key-value pairs.

Question 9

Which method would you use to get all the elements in a dictionary returned as a list of tuples?

A) list
B) items
C) pop
D) keys

Question 10

What is the correct structure to create a dictionary of months where each month will be accessed by its month number (for example,January is month 1,April is month 4)?

A) { 1 ; 'January', 2 ; 'February', ... 12 ; 'December'}
B) { 1 : 'January', 2 : 'February', ... 12 : 'December' }
C) [ '1' : 'January', '2' : 'February', ... '12' : 'December' ]
D) { 1, 2,... 12 : 'January', 'February',... 'December' }

Question 11

Which would you use to delete an existing key-value pair from a dictionary?

A) del
B) remove
C) delete
D) unpair

Question 12

The difference of set1 and aet2 is a set that contains only the elements that appear in set1 but do not appear in set2.

Question 13

A dictionary can include the same value several times but cannot include the same key several times.

Question 14

The issubset()method can be used to determine whether set1 is a subset of set2.

Question 15

In a dictionary,you use a(n)__________ to locate a specific value.

A) datum
B) element
C) item
D) key

Question 16

Which method can be used to add a group of elements to a set?

A) add
B) addgroup
C) update
D) addset

Question 17

The union of two sets is a set that contains only the elements that appear in both sets.

Question 18

What is the number of the first index in a dictionary?

A) 0
B) 1
C) the size of the dictionary minus one
D) Dictionaries are not indexed by number.

Question 19

The set remove and discard methods behave differently only when a specified item is not found in the set.

Question 20

What is the value of the variable phones after the following code executes?
Phones = {'John' : '5555555','Julie' : '5557777'}
Phones['John'] = 5556666'

A) {'John' : '5555555', 'Julie' : '5557777'}
B) {'John' : '5556666', 'Julie' : '5557777'}
C) {'John' : '5556666'}
D) This code is invalid.

Question 21

To add a single item to a set,you can use the set __________ method.

Question 22

What does the get method do if the specified key is not found in the dictionary?

A) It throws an exception.
B) It does nothing.
C) It returns a default value.
D) You cannot use the get method to specify a key.

Question 23

The __________ method clears the contents of a dictionary.

Question 24

The built-in function,__________,returns the number of items in a set.

Question 25

To write an object to a file,you use the __________ function of the __________ module.

Question 26

Each element in a(n)__________ has two parts: a key and a value.

Question 27

The elements in a dictionary are not stored in a specific order.
Therefore,a dictionary is not a(n)___________.

Question 28

Each element in a dictionary view is a __________.

Question 29

The __________ method returns a value associated with a specific key and,if found,removes that key-value pair from the dictionary.

Question 30

What will be displayed after the following code executes? (Note: the order of the display of entries in a dictionary are not in a specific order.)

A) {'FL': 'Tallahassee'}
B) KeyError
C) {'CA': 'San Diego', 'NY': 'Albany', 'GA': 'Atlanta', 'FL' 'Tallahassee'}
D) {'CA': 'San Diego', 'NY': 'Albany', 'GA': 'Atlanta'}

Question 31

What will be displayed after the following code executes? (Note: the order of the display of entries in a dictionary are not in a specific order.)

A) {'FL': 'Tallahassee'}
B) KeyError
C) {'GA': 'Atlanta', 'FL': 'Tallahassee', 'NY': 'Albany', 'CA': 'San Diego'}
D) {'CA': 'San Diego', 'NY': 'Albany', 'GA': 'Atlanta'}

Question 32

A(n)__________ is an object that holds multiple unique items of data in an unordered manner.

Question 33

In order to avoid KeyError exceptions,you can check whether a key is in the dictionary using the __________ operator.

A) included
B) in
C) isnotin
D) isin

Question 34

What is the process used to convert an object to a stream of bytes that can be saved in a file?

A) pickling
B) streaming
C) writing
D) dumping

Question 35

The __________ method returns all of a dictionary's keys as a dictionary view.

Question 36

What will be displayed after the following code executes? (Note: the order of the display of entries in a dictionary are not in a specific order.)

A) {'CA': 'Sacramento'}
B) ['CA': 'Sacramento']
C) {'NY': 'Albany', 'GA': 'Atlanta'}
D) {'CA': 'Sacramento', 'NY': 'Albany', 'GA': 'Atlanta'}

Question 37

To determine whether or not a key is included in a dictionary,or if an element is included in a set,you can use the ___________ operator.

Question 38

The __________ of two sets is a set that contains all the elements of both sets.

Question 39

Which of the following does not apply to sets?

A) The stored elements can be of different data types.
B) All the elements must be unique; you cannot have two elements with the same value.
C) The elements are unordered.
D) The elements are in pairs.