Deck 9: Dictionaries and Sets

Question 1

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.

Answer 1

A

Question 2

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

Answer 2

C

Question 3

Sets are immutable.

Answer 3

False

Question 4

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

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

Question 5

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

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

Question 6

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

Question 7

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 8

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

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

Question 9

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 10

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 11

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

Question 12

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 13

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

Question 14

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.

Question 15

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 16

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 17

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 18

Sets are created using curly braces {}.

Question 19

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 20

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

Question 21

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

Question 22

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

Question 23

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

Question 24

The _______________ method clears the contents of a dictionary.

Question 25

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

Question 26

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

Question 27

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

Question 28

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

Question 29

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

Question 30

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 31

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

Question 32

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

Question 33

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

Question 34

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 35

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