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Tricky Python MCQ Questions for Experienced Developers
Quick Quiz
Is it possible to use a list as a key in a Python dictionary?
a. Yes
b. No
Option b – No
Which function is used to count the number of elements in a list?
a. total()
b. sum()
c. len()
d. keys()
Option c – len()
What does the items()
method of a dictionary return?
a. A tuple containing all the dictionary’s keys
b. A tuple containing all the keys and values
c. A tuple of all key-value pairs
Option b – A tuple containing all the keys and values
What is the output of the values()
method when used on a dictionary?
a. A tuple of all keys in the dictionary
b. A tuple of keys and values in the dictionary
c. A tuple containing only the values from the dictionary
Option c – A tuple containing only the values from the dictionary
Which method would you use to update the value of an existing key in a dictionary?
a. modify()
b. update()
c. change()
d. new()
Option b – update()
What does the keys()
method return when used on a dictionary?
a. A tuple of all keys in the dictionary
b. A tuple with both keys and values
c. A tuple containing each key-value pair
Option a – A tuple of all keys in the dictionary
What keyword is used to check if a key exists within a dictionary?
a. is
b. in
c. check if
d. None
Option b – in
Which of the following is a valid way to check if a key is present in a dictionary?
a. Using the in
keyword
b. Using the exists()
function
c. Using the has_key()
method
d. Using the check_key()
function
Option a – Using the in keyword
Are dictionaries immutable in Python?
a. False
b. True
Option b – True
Do dictionaries allow accessing elements by their position, and must all keys be of the same data type?
a. True
b. False
Option b – False
Can the keys in a dictionary be mutable?
a. True
b. False
Option a – True
Which option represents a structure that provides information about data attributes?
a. Data dictionary
b. Data flow diagram
c. Decision tree
d. Decision flow
Option a – Data dictionary
Can dictionaries have lists or tuples as their values?
a. Yes
b. No
Option a – Yes
What characteristic must dictionary keys possess?
a. Antique
b. Unique
c. Mutable
d. Integers
Option b – Unique
How is a dictionary classified in terms of data structure in Python?
a. Mutable data type
b. Non-mutable data type
c. Mapping data type
d. Both a and c
Option d – Both a and c
What is the correct way to iterate over the elements in a dictionary?
a. Using an if statement
b. Using a loop
c. Using a jump statement
d. None of these
Option b – Using a loop
Which of these data types is categorized as a mapping type in Python?
a. List
b. Tuple
c. String
d. Dictionary
Option d – Dictionary
Identify the incorrect statement regarding Python dictionaries:
a. The entries in a dictionary are not stored in order.
b. A dictionary can have keys that are repeated.
c. Keys in dictionaries cannot be changed, but values can.
d. Keys can be strings, numbers, or a mix of both.
Option b – A dictionary can have keys that are repeated.
Choose the accurate statement:
i. Different keys in a dictionary can have the same value.
ii. Values in a dictionary are accessed by their index.
a. i is True, ii is False
b. i is False, ii is True
c. Both are True
d. Both are False
Option a – i is True, ii is False
Which option shows the correct way to declare a dictionary?
a. D = ([a, 10], (‘b’, 20])
b. D = ((‘a’, 10), (‘b’, 20))
c. D = {‘a’, 10: ‘b’, 20}
d. D = {‘a’: 10, ‘b’: 20}
Option d – D = {‘a’: 10, ‘b’: 20}
What does the size of a dictionary represent?
a. Total number of values in it
b. Total number of keys in it
c. Total key-value pairs it contains
d. Number of indices in the dictionary
Option c – Total key-value pairs it contains
Which method retrieves all the keys from a dictionary?
a. Key()
b. Keys()
c. Value()
d. Values()
Option b – Keys()
Which method gives all key-value pairs from a dictionary as tuples?
a. dict()
b. items()
c. get()
d. keys()
Option b – items()
Does adding a new key and value to a dictionary result in an error because the size changes?
a. True
b. False
Option b – False
Why are lists unsuitable for use as dictionary keys?
i. Keys need to be unchangeable, but lists can be changed.
ii. Keys represent individual items, while lists contain multiple items.
a. Both statements are True
b. Both statements are False
c. i is True, ii is False
d. i is False, ii is True
Option c – i is True, ii is False
Why can’t slicing be used on dictionaries?
a. Dictionaries organize data using key:value structure
b. Dictionaries are not sequences and don’t maintain order
c. Dictionary keys are fixed and cannot change
d. Dictionary keys cannot be lists
Option b – Dictionaries are not sequences and don’t maintain order
Which data type is most appropriate for saving your friends’ names with their phone numbers?
a. List
b. String
c. Tuple
d. Dictionary
Option d – Dictionary
What occurs when the code del d
is applied to the dictionary {1:30, 2:60, 3:90}
?
a. Removes all items within the dictionary
b. Deletes the entire dictionary object
c. Produces an error
d. Eliminates the first entry from the dictionary
Option b – Deletes the entire dictionary object
What is the primary function of a dictionary in Python? ( Tricky Python MCQ Questions for Experienced Developers )
a. Organizing data in a specific sequence
b. Holding data as key-value associations
c. Managing data using stack behavior
d. Storing information in a list format
Option b – Holding data as key-value associations
In Python, which symbols are used to define dictionary entries?
a. () — Parentheses
b. [] — Square brackets
c. {} — Curly braces
d. <> — Angle brackets
Option c – {} — Curly braces
Which of the following cannot be used as a key in a Python dictionary?
a. Integer
b. Float
c. String
d. List
Option c – String
How can you access a value linked to a specific key in a dictionary?
a. By using its index position
b. By iterating through a loop
c. By referencing the key with square brackets
d. By using the value()
function
Option c – By referencing the key with square brackets
What happens if you attempt to access a dictionary key that doesn’t exist? ( Tricky Python MCQ Questions for Experienced Developers )
a. A ValueError is triggered
b. It returns None
c. A KeyError is thrown
d. It provides an empty dictionary
Option c – A KeyError is thrown
What is the correct way to insert a new key-value entry into a dictionary?
a. By applying the append()
function
b. By using the add()
function
c. By calling the insert()
function
d. By assigning a value directly to a new key
Option d – By assigning a value directly to a new key
Which function is used to eliminate a key-value pair from a dictionary? ( Tricky Python MCQ Questions for Experienced Developers )
a. append()
b. add()
c. insert()
d. pop()
Option d – pop()
What is the result of calling the pop()
method with a key that doesn’t exist in the dictionary?
a. It yields None
b. A KeyError is raised
c. The last entry in the dictionary is removed
d. It returns False
Option b – A KeyError is raised
Which method provides all the keys stored in a dictionary?
a. keys()
b. get_keys()
c. all_keys()
d. dict_keys()
Option d – dict_keys()
What is returned by the values()
method in a dictionary?
a. A list containing only the values
b. A list with all the keys
c. A collection of key-value entries
d. An iterable containing the values
Option d – An iterable containing the values
Which method retrieves all key-value entries from a dictionary?
a. items()
b. key_value_pairs()
c. get_items()
d. pairs()
Option a – items()
What method should you use to make a shallow copy of a dictionary? ( Tricky Python MCQ Questions for Experienced Developers )
a. clone()
b. copy()
c. deepcopy()
d. duplicate()
Option b – copy()
If a
is a dictionary with some key-value pairs, what does a.popitem()
do?
a. Removes a random key-value pair
b. Deletes all the key-value pairs
c. Removes the pair for the specified key
d. It is not a valid dictionary method
Option a – Removes a random key-value pair
A copy of a dictionary where both keys and values are fully duplicated is called a: ( Tricky Python MCQ Questions for Experienced Developers )
a. Key copy
b. Shallow copy
c. Deep copy
d. Partial copy
Option c – Deep copy
Which method allows you to retrieve the value for a specific key, and return a default if the key doesn’t exist?
a. get()
b. fetch()
c. lookup()
d. find()
Option a – get()
Which of the following correctly defines a dictionary in Python?
a. d = {}
b. d = {40: “john”, 45: “peter”}
c. d = {“john”: 40, “peter”: 45}
d. All of the above
Option d – All of the above
Which types of values are allowed to be used as keys in a Python dictionary?
a. All data types
b. Only data types that are immutable
c. Only mutable types
d. None of these
Option b – Only data types that are immutable
How do the keys()
and values()
functions differ in Python dictionaries?
a. keys()
returns all the dictionary keys as a list, while values()
returns all the corresponding values.
b. keys()
gives a set of keys, and values()
returns a set of values.
c. keys()
produces a tuple of keys, and values()
gives a tuple of values.
d. None of these options are correct
Option a – keys() returns all the dictionary keys as a list, while values() returns all the corresponding values.
What distinguishes the items()
method from the popitem()
method in dictionaries? ( Tricky Python MCQ Questions for Experienced Developers )
a. items()
gives all key-value pairs, while popitem()
deletes and returns one random key-value pair.
b. items()
returns the key-value pairs as a set, and popitem()
removes and returns one at random.
c. items()
provides the pairs as a tuple, and popitem()
deletes and returns a random pair.
d. None of these are correct
Option a – items() gives all key-value pairs, while popitem() deletes and returns one random key-value pair.
Which option correctly represents dictionary comprehension in Python?
a. (key: value for key, value in d.items())
b. (key: value for key in d.keys())
c. {key: value for value in d.values()}
d. All of these options
Option d – All of these options
How can you properly loop through a dictionary in Python? ( Tricky Python MCQ Questions for Experienced Developers )
a. for key, value in d.iterms():
b. for key in d.keys):
c. for value in d.values():
d. All of these options
Option d – All of these options
What is the correct method to find the highest value in a Python dictionary?
a. max(d.values())
b. min(d.values())
c. d.max()
d. d.min()
Option a – max(d.values())
What is the right approach to retrieve the smallest value from a dictionary?
a. max(d.values())
b. min(d.values())
c. d.max()
d. d.min()
Option b – min(d.values())
How can you accurately compare two dictionaries for equality? ( Tricky Python MCQ Questions for Experienced Developers )
a. d1 == d2
b. d1 is d2
c. d1.keys() == d2.keys() and d1.values() == d2.values()
d. All of the above
Option c – d1.keys() == d2.keys() and d1.values() == d2.values()
Which function can be used to retrieve a value by key with a fallback option if the key is absent?
a. d.get(key, default_value)
b. d.setdefault(key, default_value)
c. d.pop(key, default_value)
d. None of these
Option b – d.setdefault(key, default_value)
How do you add a new key-value pair to a dictionary only if the key isn’t already present? ( Tricky Python MCQ Questions for Experienced Developers )
a. d.get(key, default_value)
b. d.setdefault(key, default_value)
c. d.pop(key, default_value)
d. None of these
Option b – d.setdefault(key, default_value)
What is the correct method to assign a new value to an existing key in a dictionary?
a. d[key] = new_value
b. d.update({key: new_value})
c. Both (a) and (b)
d. None of these
Option c – Both (a) and (b)
Which methods can be used to remove a key-value entry from a dictionary when the key exists?
a. del d[key]
b. d.pop(key)
c. Both (a) and (b)
d. None of these
Option c – Both (a) and (b)
What is the correct syntax for duplicating a dictionary while omitting certain keys? ( Tricky Python MCQ Questions for Experienced Developers )
a. {key: value for key, value in d.items() if key not in exclude_keys}
b. {key: value for key in d.keys() if key not in exclude_keys}
c. {key: value for value in d.values() if key not in exclude_keys}
d. None of these
Option a – {key: value for key, value in d.items() if key not in exclude_keys}
How can you generate a list of dictionary keys that begin with a specific character?
a. {key: value for key, value in d.items() if key[0] == “a”}
b. {key: value for key in d.keys() if key[0] == “a”}
c. {key: value for value in d.values() if key[0] == “a”}
d. None of these
Option a – {key: value for key, value in d.items() if key[0] == “a”}
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