Python Dictionary Quiz [15 dict Quiz Questions]

This Python dictionary quiz provides Multiple Choice Questions(MCQs) to test and solidify your understanding of how dictionaries work in Python.

The quiz covers questions on the below topics.

Dictionary Creation: Various ways to define and initialize dictionaries.
Accessing Elements: Retrieving values using their corresponding keys.
Modifying Dictionaries: Adding, updating, and deleting key-value pairs.
Dictionary Methods: Utilizing built-in functions like keys(), values(), items(), get(), pop(), update(), and clear().
Dictionary Properties: Understanding concepts like mutability and the immutability of keys.
Nested Dictionaries: Working with dictionaries within dictionaries.

Also, See:

Python Dictionary Exercise.
15 Python Quizzes: each focusing on a specific topic

The quiz contains 25 questions. There is no time limit.
Explanation is provided for each answer.
You will get 1 point for each correct answer. Solve 15 correctly to pass the test
Read guide on Dictionaries in Python to solve this quiz

1. Select the correct ways to get the value of marks key.

student = {
  "name": "Emma",
  "class": 9,
  "marks": 75
}

m = student.get(2)

m = student.get('marks')

m = student['marks'])

Both B and C

2. What will be the output of the following Python code?

d1 = {"a": 1, "b": 2}
d2 = {"b": 3, "c": 4}
d1.update(d2)
print(d1["b"])

3. In Python, Dictionaries are immutable

False

True

4. Dictionary keys must be immutable

True

False

5. Which of the following best describes a Python dictionary?

An ordered, mutable collection that stores unique elements.

An unordered collection of unique, immutable keys mapped to mutable values.

An ordered collection of values indexed by integers.

An unordered, mutable collection of unique, hashable keys mapped to values.

6. What will be the output of the following Python code?

mapping = dict(zip(['one', 'two'], [1, 2]))
print(mapping)

{'one': 1, 'two': 2}

[('one', 1), ('two', 2)]

{'one': [1], 'two': [2]}

Error

7. What will be the output of the following Python code?

data = {"x": 10, "y": 20}
data["z"] = data.pop("x")
print(data)

{'y': 20, 'x': 10}

{'y': 20, 'z': 10}

{'x': 10, 'z': 10}

Error

8. Which of the following is NOT a valid way to create a Python dictionary?

{"key": "value"}

dict(name="Alice", age=30)

dict([("a", 1), ("b", 2)])

dict(1="one", 2="two")

9. What will be the output of the following Python code?

config = {"theme": "dark", "font_size": 12}
config.setdefault("language", "en")
config.setdefault("theme", "light") # Already exists
print(config)

{'theme': 'dark', 'font_size': 12, 'language': 'en'}

{'theme': 'light', 'font_size': 12, 'language': 'en'}

{'theme': 'dark', 'font_size': 12}

Error

10. Please the correct way to empty following dictionary

student = { 
  "name": "Emma", 
  "class": 9, 
  "marks": 75 
}

del student

del student[0:2]

student.clear()

11. What will be the output of the following Python code?

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

2
{‘a’: 1, ‘b’: 2}

2
{‘a’: 1}

{‘a’: 1}
2

Error

12. Why must dictionary keys be immutable (hashable)?

To allow for faster iteration over the dictionary.

To ensure keys can be easily sorted.

Because dictionaries use a hashing mechanism internally, and the hash value of a key must remain constant.

To prevent accidental modification of keys.

13. Select all correct way to remove the key marks from a dictionary

student = { 
  "name": "Emma", 
  "class": 9, 
  "marks": 75 
}

student.pop("marks")

del student["marks"]

student.popitem("marks")

Both A and B

14. Select correct ways to create an empty dictionary

sampleDict = {}

sampleDict = dict()

sampleDict = dict{}

Both A and B

15. What will be the output of the following Python code?

dict1 = {"key1":1, "key2":2}
dict2 = {"key2":2, "key1":1}
print(dict1 == dict2)

True

False

16. What happens if you try to add a new key-value pair to a dictionary where the key already exists?

A KeyError is raised.

The operation fails silently.

The existing value associated with that key is updated with the new value.

A new entry is created for the duplicate key.

17. What does dict.fromkeys(['a', 'b'], 0) return?

{'a': 0, 'b': 0}

{'a': ['a', 'b'], 'b': 0}

[('a', 0), ('b', 0)]

dict_keys(['a', 'b'])

18. What do dict.keys(), dict.values(), and dict.items() return in Python 3?

Lists

Tuples

Set-like view objects

Iterators that must be consumed immediately

19. What will be the output of the following Python code?

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

Error

20. Which method is used to remove all key-value pairs from a dictionary, making it empty?

dict.delete_all()

dict.clear()

del my_dict

dict.empty()

21. Which of the following iterables can be directly converted to a dictionary using the dict() constructor?

A list of single elements: [1, 2, 3]

A list of tuples, where each tuple has two elements (key, value): [('a', 1), ('b', 2)]

A string: "hello"

A set: {1, 2, 3}

22. What will be the output of the following Python code?

data = {"name": "Alice", "age": 30}
print("name" in data)
print("city" in data)

True
False

True
True

False
False

False
True

23. What does the dict.popitem() method do?

Removes and returns a random key-value pair.

Removes and returns the last inserted key-value pair (in Python 3.7+).

Removes and returns the first inserted key-value pair (in Python 3.7+).

Both A and B (behavior changed in Python 3.7).

24. Which method is used to get the value associated with a given key, returning None or a specified default if the key is not found?

dict.get(key)

dict.find(key)

dict.value(key)

dict.lookup(key)

25. What is the primary use case for the dict.setdefault(key, default_value) method?

To update an existing key’s value to default_value.

To remove a key if it exists, otherwise do nothing.

To get the value of a key, and if the key is not found, insert it with default_value and return that value.

To sort the dictionary by keys and set default values.

Python Dictionary Quiz

About Vishal

Related Tutorial Topics:

All Coding Exercises:

Python Exercises and Quizzes

About PYnative

Follow Us

Explore Python

Coding Exercises

Legal Stuff