Dictionaries

Question 1

Create a dictionary

Answer 1

dictionary = { “key1”: “value1”, “key2”: “value2”}

Question 2

Access value by key in dictionary

Answer 2

dictionary[“key1”]

Question 3

Add of update key value pair

Answer 3

dictionary[“key3”] = “value3”

Question 4

Delete key value pair

Answer 4

del dictionary[“key1”]

Question 5

Check if key exists

Answer 5

‘key1’ in dictionary

Question 6

Get list of keys in dictionary

Answer 6

list(dictionary.keys())

Question 7

Get list of values in dictionary

Answer 7

list(dictionary.values())

Question 8

Update dictionary with elements from another dictionary, if key already exists, its value is updated, if the key doesn’t exist, it is added

Answer 8

dictionary.update(another_dictionary)

Question 9

If key doesn’t exist set default value

Answer 9

dictionary.setdefault(‘key’, ‘default_value’)

Question 10

Create a dictionary from array of keys with default value

Answer 10

dict.fromkeys(arr, value)

Question 11

Remove key from dictionary and return value

Answer 11

dictionary.pop(‘key’)

Question 12

Remove and return the last inserted key-value pair as a tuple

Answer 12

key, value = dictionary.popitem()

Question 13

Loop through keys in dictionary

Answer 13

for key in my_dict:
print(key)

Question 14

Loop through both key and value in dictionary

Answer 14

for key, value in my_dict.items():
print(key, value)