Question 1

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

Accepted Answer

A for loop is one way to iterate over the elements in a set.

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

Accepted Answer

The pop method is used to remove the key-value pair from the dictionary and returns the value associated with that key. This method takes a key as an argument and removes the key-value pair from the dictionary. The items method returns a list of tuples containing key-value pairs, while the popitem method removes and returns an arbitrary (key, value) pair from the dictionary. Using a list would not be an efficient way to get the value associated with a specific key and remove that key-value pair from the dictionary.

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

Accepted Answer

The code tries to access the value of the key 'Brianna' which is not present in the dictionary. Hence, it will result in a KeyError.

Question 4

Sets are immutable.

Accepted Answer

Sets in Python are mutable, meaning their elements can be changed after the set has been created.

Question 5

Sets are created using curly braces { }.

Accepted Answer

The answer of 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

Accepted Answer

The function `len()` is used to get the length or number of elements in a dictionary. The other options are not valid in Python dictionaries.

Question 7

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

Accepted Answer

This statement is true. If you try to retrieve a value from a dictionary using a nonexistent key, a KeyError exception will be raised.

Question 8

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

Accepted Answer

The elements in a dictionary are not stored in any particular order. The order of retrieval of the key-value pairs may vary each time the dictionary is accessed.

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

Accepted Answer

The `items()` method returns a list of tuples, containing the key-value pairs of the dictionary. Therefore, it is the best choice for getting all the elements of a dictionary as a list of tuples. The `list()` method can also be used to convert the dictionary to a list of tuples, but it is a less direct approach. The `pop()` method removes and returns the value for a specified key, and the `keys()` method only returns a list of the keys in the dictionary.

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' }

Accepted Answer

In Python, dictionaries follow the key-value pair structure, where the key is always separated from the value by a colon. Option B follows this structure correctly, with each key (month number) separated from its corresponding value (month name) by a colon. Option A has semicolons instead of colons, which is incorrect. Option C has keys in string format, which is not recommended for numerical keys. Option D has a comma separated list of keys, which is not the correct syntax for dictionaries.

Question 11

Which would you use to delete an existing key-value pair from a dictionary?
A) del
B) remove
C) delete
D) unpair

Accepted Answer

We use the 'del' keyword to delete an existing key-value pair from a dictionary.

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.

Accepted Answer

This is the definition of the set difference operation.

Question 13

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

Accepted Answer

In a dictionary, each key must be unique, but the same value can be associated with multiple keys.

Question 14

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

Accepted Answer

The issubset() method returns True if all elements of set1 are also present in set2. Therefore, it 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

Accepted Answer

In a dictionary, a key is a unique identifier for each value/object. By using the key, you can locate the specific value/object you are looking for in the dictionary.

Question 16

Which method can be used to add a group of elements to a set?
A) add
B) addgroup
C) update
D) addset

Accepted Answer

the "update" method can be used to add a group of elements to a set. It takes an iterable object as an argument, such as a list or another set, and adds each element to the set individually.

Question 17

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

Accepted Answer

The union of two sets is a set that contains all the elements from both sets, not just the elements that appear in both sets. The intersection of two sets is the 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.

Accepted Answer

Dictionaries in programming, especially in languages like Python, are not indexed by numerical indices but rather by keys. These keys can be of various types (e.g., strings, numbers), and they are used to access the corresponding values stored in the dictionary.

Question 19

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

Accepted Answer

The remove method will raise a KeyError if the specified item is not found in the set, while the discard method will simply do nothing.

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.

Accepted Answer

After the second line of code, the value for the key 'John' is updated to '5556666', so the resulting dictionary will be {'John' : '5556666', 'Julie' : '5557777'}.

Quiz 9: Dictionaries and Sets

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

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

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

Sets are immutable.

Sets are created using curly braces { }.

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

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

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

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

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) ?

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

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

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

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

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

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

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

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

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

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