Deck 10: Dictionaries and Sets

Question 1

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 - no two elements can have the same value.
C) The elements are unordered.
D) The elements are pairs.

Answer 1

D

Question 2

What would 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 2

D

Question 3

Sets are created using curly braces {}.

Answer 3

False

Question 4

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

Question 5

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

A) Throw an exception
B) Nothing
C) Return a default value
D) You do not specify a key for the get method

Question 6

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

A) size
B) length
C) len
D) invalid code

Question 7

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

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

Question 8

You created the following dictionary relationships = {'Jimmy':'brother'}. You then executed the following code, and received a KeyError exception. What is the reason for the exception? relationships['jimmy']

A) String comparisons are case sensitive so 'jimmy' does not equal 'Jimmy'.
B) You used the wrong syntax for creating the dictionary.
C) You should have used the code relationships['brother'].
D) There is a bug in Python.

Question 9

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

A) included
B) of
C) in
D) not in

Question 10

What is the correct structure for creating a dictionary of month names to be accessed by month numbers?

A) { 1 ; 'January', 2 ; 'february', 3 ; 'March' }
B) { 1 : 'January', 2 : 'february', 3 : 'March' }
C) [ 1 : 'January', 2 : 'february', 3 : 'March' ]
D) { 1, 2, 3 : 'January', 'february', 'March' }

Question 11

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

A) 0
B) 1
C) Dictionary is not indexed by number.
D) Size of the dictionary minus one.

Question 12

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

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

Question 13

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

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

Question 14

What is the value of the variable phones after the execution of the following code? phones = {'John': '5555555', 'Julie' : '7777777'}
Phones['John'] = '1234567'

A) {'John': '5555555', 'Julie' : '7777777'}
B) {'John': '1234567', 'Julie' : '7777777'}
C) {'John': '1234567' }
D) invalid code

Question 15

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 16

Sets are immutable.

Question 17

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

Question 18

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

A) add
B) addgroup
C) update
D) Elements must be added one at a time.

Question 19

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

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

Question 20

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

Question 21

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

Question 22

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

Question 23

The index of the first key-value pair in a dictionary is 0.

Question 24

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

Question 25

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

Question 26

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

Question 27

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

Question 28

The index of the first element in a set is 0.

Question 29

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

Question 30

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

Question 31

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

Question 32

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

Question 33

The _______________ method clears the contents of a dictionary.

Question 34

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

Question 35

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