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. 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.

2. 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

3. 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

4. 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)

5. Please the correct way to empty following dictionary

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

del student

del student[0:2]

student.clear()

6. 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

7. Select correct ways to create an empty dictionary

sampleDict = {}

sampleDict = dict()

sampleDict = dict{}

Both A and B

8. 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}

9. 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'])

10. 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.

11. 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

12. 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

13. 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.

14. 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

15. 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

16. Dictionary keys must be immutable

True

False

17. 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).

18. Select the correct way to access the value of a history subject

sampleDict = { 
   "class":{ 
      "student":{ 
         "name":"Mike",
         "marks":{ 
            "physics":70,
            "history":80
         }
      }
   }
}

sampleDict['class']['student']['marks']['history']

sampleDict['class']['student']['marks'][1]

sampleDict['class'][0]['marks']['history']

All of the above

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. What will be the output of the following dictionary operation?

dict1 = {"name": "Mike", "salary": 8000}
temp = dict1.pop("age")
print(temp)

KeyError: ‘age’

None

21. 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

22. 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.

23. 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

24. 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")

25. 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}

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