dictionary methods

Question 1

Method to get a list of all keys in a dictionary

Answer 1

.keys() (returns a view object)

Question 2

Method to get a list of all values in a dictionary

Answer 2

.values() (returns a view object)

Question 3

Method to get a list of (key, value) tuples

Answer 3

.items() (returns a view object)

Question 4

Method to remove a key-value pair using the key and return its value

Answer 4

.pop(key, [default])

Question 5

Method to remove and return an arbitrary (random) key-value pair

Answer 5

.popitem()

Question 6

Method to clear all key-value pairs from the dictionary

Answer 6

.clear()

Question 7

Method to get the value for a given key, or a default value if the key is not found

Answer 7

.get(key, [default])

Question 8

Method to insert key-value pairs from another dictionary or iterable into the current dictionary

Answer 8

.update(other_dict)

Question 9

Method to return a new dictionary with specified keys and a default value for each

Answer 9

.fromkeys(iterable, [value])

Question 10

Method to insert a key with a value if the key does not already exist

Answer 10

.setdefault(key, [default_value])

Question 11

What is the time complexity for looking up a key in a Python dictionary?

Answer 11

O(1) (Constant time)