Python Dictionary Methods

Question 1

What does the get() method do in a dictionary?

Answer 1

It retrieves the value for a specified key, returning None if the key is not found.

Question 2

Define keys() method.

Answer 2

Returns a view object displaying a list of all the keys in the dictionary.

Question 3

What does the values() method return?

Answer 3

It returns a view object displaying a list of all the values in the dictionary.

Question 4

Fill in the blank: The items() method returns _______.

Answer 4

A view object of key-value pairs in the dictionary.

Question 5

True or false: The update() method adds key-value pairs to a dictionary.

Answer 5

TRUE

It can also update existing keys with new values.

Question 6

What does the pop() method do?

Answer 6

Removes and returns the value associated with a specified key.

Question 7

Define popitem() method.

Answer 7

Removes and returns the last inserted key-value pair as a tuple.

Question 8

What is the purpose of the clear() method?

Answer 8

It removes all items from the dictionary.

Question 9

Fill in the blank: The setdefault() method returns the value of a key, and if not present, it sets it to _______.

Answer 9

A default value.

Question 10

True or false: The copy() method creates a shallow copy of the dictionary.

Answer 10

TRUE

Changes to the copy do not affect the original dictionary.

Question 11

What does the fromkeys() method do?

Answer 11

Creates a new dictionary with specified keys and a default value.

Question 12

Define del statement in the context of dictionaries.

Answer 12

It removes a specified key and its associated value from the dictionary.

Question 13

What is the result of using len() on a dictionary?

Answer 13

It returns the number of key-value pairs in the dictionary.

Question 14

Fill in the blank: The in keyword checks if a key is _______ in a dictionary.

Answer 14

Present.

Question 15

True or false: Dictionary keys can be mutable types.

Answer 15

FALSE

Only immutable types like strings, numbers, and tuples can be keys.

Question 16

What does the dict() constructor do?

Answer 16

Creates a new dictionary from an iterable or keyword arguments.

Question 17

Define dict comprehension.

Answer 17

A concise way to create dictionaries using a single line of code.

Question 18

What is the purpose of the update() method?

Answer 18

It merges another dictionary or iterable of key-value pairs into the current dictionary.

Question 19

Fill in the blank: The get() method can take a second argument as a _______.

Answer 19

Default value.

Question 20

True or false: Dictionary values can be of any data type.

Answer 20

TRUE

Values can be strings, lists, dictionaries, etc.

Question 21

What does the view() method return?

Answer 21

It returns a view object that displays a dynamic view of the dictionary’s entries.

Question 22

Define nested dictionaries.

Answer 22

Dictionaries that contain other dictionaries as values.

Question 23

What is the output of d.get(‘key’, ‘default’) if ‘key’ is not in d?

Answer 23

It returns ‘default’.

Question 24

Fill in the blank: The keys() method returns a _______ object.

Answer 24

View.

Question 25

True or false: You can iterate through a dictionary using a for loop.

Answer 25

TRUE ## Footnote Iteration defaults to keys, but can also access values or items.

Question 26

What does the **setdefault()** method return if the key exists?

Answer 26

It returns the existing value for that key.