Graded Questions

Question 1

How can you remove a specific key from a dictionary without raising an error if the key does not exist?

Using the remove method.

Using the delete method.

Using the pop method.

Using the discard method.

Question 2

What is the output of the following code?

my_dict = {"a": 1, "b": 2, "c": 3} items = my_dict.items() items[0] = ("d", 4) print(my_dict)

{"a": 1, "b": 2, "c": 3}

{"d": 4, "b": 2, "c": 3}

This code will raise an error.

{"a": 1, "b": 2, "c": 3, "d": 4}

Question 3

How do you check if a key exists in a dictionary?

Using the contains method.

Using the has_key method.

Using the in keyword.

Using the exists function.

Question 4

What is a dictionary in python?

A collection of ordered elements.

A collection of key-value pairs.

A collection of integers.

A collection of strings.

Question 5

How do you get the list of values in a dictionary?

Using the values() method.

Using the get_values() method.

Using the list_values() method.

Using the get_all() method.

Question 6

How can you combine two dictionaries into a new dictionary in Python?

Using the join method.

Using the combine method.

Using the + operator.

Using the extend method.

Question 7

What is the output of the following code?

my_dict = {"a": 1, "b": 2, "c": 3} values = my_dict.values() values.append(4) print(my_dict)

{"a": 1, "b": 2, "c": 3}

{"a": 1, "b": 2, "c": 3, 4}

This code will raise an error.

{"a": 1, "b": 2, "c": 3, [4]}

Question 8

How do you access the value associated with a specific key in a dictionary?

By using the get method.

By using square brackets [ ]

By using the value method.

By using the access keyword.

Question 9

How do you sort a dictionary by its values in ascending order?

Using the sort() method.

Using the sorted() function with a custom key function.

Dictionaries cannot be sorted by values.

Using the sort_values() method.

Question 10

How can you update the value associated with a specific key in a dictionary?

Using the update method.

Using square brackets [ ].

Using the set method.

Using the modify method.

Question 11

What is the output of the following code?

import copy my_dict = {"a": [1, 2, 3], "b": [4, 5, 6]} new_dict = copy.copy(my_dict) new_dict["a"].append(99) print(my_dict["a"])

[1, 2, 3].

[1, 2, 3, 99].

[4, 5, 6].

This code will raise an error.

Question 12

How can you remove all key-value pairs from a dictionary?

Using the clear method.

Using the remove_all method.

Using the delete_all method.

Using the empty method.

Question 13

How can you create a dictionary with default values for missing keys using a lambda function?

Using the defaultdict class with a lambda function.

Using the create_dict function with a lambda function.

Using the default method with a lambda function.

Default values cannot be set using lambda functions.

Question 14

What is the output of the following code?

my_dict = {"b": 2, "a": 1, "c": 3} sorted_dict = sorted(my_dict.items(), key=lambda x: x[1]) print(sorted_dict)

{"a": 1, "b": 2, "c": 3}

[("a", 1), ("b", 2), ("c", 3)]

{"b": 2, "a": 1, "c": 3}

This code will raise an error.

Question 15

Which of the following is a valid way to create an empty dictionary in python?

empty_dict={}

empty_dict=dict({1:2, 3:4})

empty_dict=()

empty_dict=[]

Question 16

What method can you use to get a list of all keys in a dictionary?

keys()

get_keys()

list_keys()

dict_keys()

Question 17

How can you create a copy of a dictionary in Python?

Using the copy method.

Using the clone method.

Using the copy.copy() function.

Dictionaries cannot be copied.

Question 18

What is the output of the following code?

keys = ["a", "b", "c"] values = [1, 2, 3] my_dict = dict(zip(keys, values)) print(my_dict)

{"a": 1, "b": 2, "c": 3}

{1: "a", 2: "b", 3: "c"}

[("a", 1), ("b", 2), ("c", 3)]

This code will raise an error.

Question 19

How can you find the number of key-value pairs in a dictionary?

Using the count method.

Using the len function.

Using the size method.

Using the length attribute.

Question 20

How can you iterate through all key-value pairs in a dictionary?

Using a for loop with in keyword.

Using a while loop.

Using a foreach loop.

Using a for loop with of keyword.

Question 21

What is the output of the following code?

my_dict = {"a": 1, "b": 2, "c": 3} if "b" in my_dict: print("Key found") else: print("Key not found")

Key found.

Key not found.

This code will raise an error.

None.

Question 22

What is the output of the following code?

my_dict = {"a": 1, "b": 2, "c": 3} new_dict = my_dict.copy() new_dict["a"] = 99 print(my_dict["a"])

KeyError

Question 23

What is the output of the following code?

my_dict = {"b": 2, "a": 1, "c": 3} sorted_dict = sorted(my_dict) print(sorted_dict)

{"a": 1, "b": 2, "c": 3}

["a", "b", "c"]

{"b": 2, "a": 1, "c": 3}

This code will raise an error.

Question 24

What is the output of the following code?

my_dict = {"a": 1, "b": 2, "c": 3} my_dict.pop("b") print(my_dict)

{"a": 1, "b": 2, "c": 3}

{"a": 1, "c": 3}

{"b": 2}

This code will raise an error.

Question 25

What is the output of the following code?

my_dict = {} if not my_dict: print("Dictionary is empty") else: print("Dictionary is not empty")

Dictionary is empty.

Dictionary is not empty.

This code will raise an error.

None.

Question 26

How can you check if a specific value exists in a dictionary?

Using the contains_value method.

Using the has_value method.

Using a for loop with in keyword.

Using the in keyword with values().

Question 27

What happens if you try to add a key that already exists in a dictionary?

It raises a KeyError.

It updates the value associated with the key.

It deletes the existing key-value pair.

It adds a new key with the same name.

Question 28

How can you create a shallow copy of a dictionary?

Using the copy method.

Using the clone method.

Using the copy.copy() function.

Dictionaries cannot be shallow copied.

Question 29

What is the output of the following code?

my_dict = {"a": 1, "b": 2, "c": 3} my_dict.clear() print(len(my_dict))

Question 30

What is the output of the following code?

dict1 = {"a": 1, "b": 2} dict2 = {"b": 3, "c": 4} combined_dict = dict1 + dict2 print(combined_dict)

{"a": 1, "b": 2, "c": 4}

{"a": 1, "b": 3, "c": 4}

{"a": 1, "b": 2}

This code will raise an error.

Question 31

How do you remove a key-value pair from a dictionary?

By using the remove method.

By using the delete method.

By using the pop method.

By using the discard method.

Question 32

How can you check if a dictionary contains a specific key?

Using the contains method.

Using the has_key method.

Using the in keyword.

Using the exists function.

Question 33

What happens if you try to access a key that does not exist in a dictionary using square brackets [ ]?

It raises a KeyError.

It returns None.

It adds the key to the dictionary with a default value.

It raises a SyntaxError.

Question 34

How can you check if a dictionary is empty?

Using the is_empty method.

Using the empty method.

Using the len function.

Using the size method.

Question 35

Which of the following is a valid use case for a dictionary in python?

Storing elements in a specific order.

Storing duplicate values.

Mapping keys to values.

Storing elements with numeric indices.

Question 36

What is the output of the following code?

from collections import defaultdict my_dict = defaultdict(lambda: "N/A") my_dict["a"] = 1 print(my_dict["b"])

N/A

KeyError

None

Question 37

How can you create a dictionary from two lists, one for keys and another for values?

Using the dict_from_lists() method.

Using the zip() function and dict() constructor.

Dictionaries cannot be created from lists.

Using the combine() method.

Question 38

What is the difference between dict.keys() and dict.values()?

dict.keys() returns a list of keys, while dict.values() returns a list of values.

dict.keys() returns a list of values, while dict.values() returns a list of keys.

There is no difference between them; they both return the same result.

dict.keys() and dict.values() are not valid methods.

Question 39

What is the output of the following code?

my_dict = {"apple": 3, "banana": 2, "cherry": 5} print(my_dict["pear"])

None

KeyError

Question 40

Which of the following is a valid way to add a new key-value pair to an existing dictionary?

dict.add(key,value)

dict[key]=value

dict.insert(key,value)

dict.append(key,value)

Question 41

Which method can be used to merge two dictionaries in Python 3.9 and later?

dict.merge().

dict.update().

dict.append().

dict.combine().

Question 42

What is the output of the following code?

my_dict = {"a": 1, "b": 2, "c": 3} my_dict["b"] = 99 print(my_dict["b"])

KeyError

Question 43

What is the output of the following code?

my_dict = {"a": 1, "b": 2, "c": 3} if 2 in my_dict.values(): print("Value found") else: print("Value not found")

Value found

Value not found

This code will raise an error.

None

Question 44

How can you create a deep copy of a dictionary?

Using the copy method.

Using the clone method.

Using the copy.deepcopy() function.

Dictionaries cannot be deep copied.

Question 45

What method can be used to get a list of all key-value pairs in a dictionary?

items().

get_items().

list_items().

dict_items().

Question 46

How do you create a dictionary with default values for keys that do not exist?

Using the defaultdict class from the collections module.

Using the create_dict function.

Using the default method.

Default values cannot be set for keys in dictionaries.

Question 47

What is the output of the following code?

my_dict = {"a": 1, "b": 2, "c": 3} for key in my_dict: print(key)

a, b, c (printed on separate lines).

Question 48

In Python, are dictionary keys case-sensitive?

Yes

Question 49

What is the output of the following code?

import copy my_dict = {"a": [1, 2, 3], "b": [4, 5, 6]} new_dict = copy.deepcopy(my_dict) new_dict["a"].append(99) print(my_dict["a"])

[1, 2, 3].

[1, 2, 3, 99].

[4, 5, 6].

This code will raise an error.

Question 50

How do you sort a dictionary by its keys in ascending order?

Dictionaries cannot be sorted.

Using the sorted() function with a custom key function.

Using the sort() method.

Using the sort_keys() method.

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