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. 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"])

2. In Python, Dictionaries are immutable

False

True

3. 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

4. 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).

5. 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

6. 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

7. Select correct ways to create an empty dictionary

sampleDict = {}

sampleDict = dict()

sampleDict = dict{}

Both A and B

8. 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

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

grades = {"Math": 90, "Science": 85, "English": 92}
for subject in grades:
    print(subject)

Math
Science
English

90
85
92

(‘Math’, 90)
(‘Science’, 85)
(‘English’, 92)

Error

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

my_dict = {"x": 10}
print(my_dict.get("y", "Key Not Found"))
print(my_dict.get("x", "Key Not Found"))

Key Not Found
10

None
10

Key Not Found
Key Not Found

Error

11. 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

12. 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

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

sampleDict = dict([
    ('first', 1),
    ('second', 2),
    ('third', 3)
])
print(sampleDict)

[ (‘first’, 100), (‘second’, 200), (‘third’, 300) ]

SyntaxError: invalid syntax

{‘first’: 1, ‘second’: 2, ‘third’: 3}

14. Is Below statement True?

Items are accessed by their position in a dictionary and All keys in a dictionary must be of the same type.

True

False

15. 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)

16. 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.

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

profile = {"name": "John", "age": 25, "city": "New York"}
keys = list(profile.keys())
keys.sort()
print(keys[0])

age

city

name

John

18. Dictionary keys must be immutable

True

False

19. In Python 3.7 and later, what is the behavior regarding dictionary key order?

Dictionaries are strictly unordered, and key order is arbitrary.

Dictionaries maintain the insertion order of keys.

Dictionaries automatically sort keys alphabetically.

Dictionaries sort keys by their hash values.

20. 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'])

21. When you use dict1.copy() to create dict2 = dict1.copy(), what kind of copy is created?

A deep copy, independent of dict1.

A shallow copy, where nested mutable objects are still shared.

Only a copy of the keys, not the values.

An error, as dictionaries cannot be copied directly.

22. 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.

23. 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

24. 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.

25. Select all correct ways to copy a dictionary in Python

dict2 = dict1.copy()

dict2 = dict(dict1)

dict2 = dict1

Both A and B

All of the above

Python Dictionary Quiz

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