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?

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

2. 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()

3. 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

4. Dictionary keys must be immutable

True

False

5. Which method removes a specified key and its associated value from a dictionary, returning the value, and raising a KeyError if the key is not found?

dict.popitem()

dict.discard()

dict.remove()

dict.pop(key)

6. Which operator or method is typically used to merge two dictionaries in Python (from Python 3.9 onwards)?

dict1.update(dict2)

dict3 = {**dict1, **dict2}

dict3 = dict1 | dict2

All of the above are valid ways to merge dictionaries (with different Python versions/behaviors).

7. Please the correct way to empty following dictionary

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

del student

del student[0:2]

student.clear()

8. 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.

9. Select the correct way to print Emma’s age.

student = {1: {'name': 'Emma', 'age': '27', 'sex': 'Female'},
           2: {'name': 'Mike', 'age': '22', 'sex': 'Male'}}

student[0][1]

student[1]["age"]

student[0]["age"]

All of the above

10. 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")

11. 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'])

12. 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.

13. 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

14. 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"])

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 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

17. In Python, Dictionaries are immutable

False

True

18. 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.

19. 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

20. 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.

21. 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}

22. 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

23. 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

24. 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

25. 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

Python Dictionary Quiz

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