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Exam 9: Dictionaries and Sets

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Question 1

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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.

E) A) and D)
F) All of the above

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Question 2

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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

E) B) and D)
F) B) and C)

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Question 3

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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) ?

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

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

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

Sets are created using curly braces { }.

Sets are immutable.

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

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

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

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

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

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

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

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

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

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

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

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