Python Dictionary Operations MCQ for Beginners. We covered all the Python Dictionary Operations MCQ for Beginners in this post for free so that you can practice well for the exam.
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Python Dictionary Operations MCQ for Beginners
How can you extract all values from a Python dictionary that are greater than a specific number?
a. {key: value for key, value in d.items() if value > 10}
b. {key: value for key in d.keys() if value > 10}
c. {key: value for value in d.values() if value > 10}
d. None of the above
Option a – {key: value for key, value in d.items() if value > 10}
How would you retrieve key-value pairs from a dictionary where the keys match a specific value?
a. {key: value for key, value in d.items() if key == "a"}
b. {key: value for key in d.keys() if key == "a"}
c. {key: value for value in d.values() if key == "a"}
d. None of the above
Option a – {key: value for key, value in d.items() if key == “a”}
Which option correctly filters key-value pairs in a dictionary where the values are equal to a given number?
a. {key: value for key, value in d.items() if value == 10}
b. {key: value for key in d.keys() if value == 10}
c. {key: value for value in d.values() if value == 10}
d. None of the above
Option a – {key: value for key, value in d.items() if value == 10}
Which is the appropriate method to obtain dictionary pairs with keys less than and values greater than certain numbers?
a. {key: value for key, value in d.items() if key < 10 and value > 10}
b. {key: value for key in d.keys() if key < 10 and value > 10}
c. {key: value for value in d.values() if key < 10 and value > 10}
d. None of the above
Option a – {key: value for key, value in d.items() if key < 10 and value > 10}
How can you find all unique values in a dictionary?
a. set(d.values())
b. dict.fromkeys(d.values())
c. Both (a) and (b)
d. None of the above
Option c – Both (a) and (b)
What is the correct way to sort a dictionary based on its values?
a. sorted(d.items(), key=lambda x: x[1])
b. sorted(d.keys(), key=lambda x: d[x])
c. sorted(d.values(), key=lambda x: x)
d. All of the mentioned
Option d – All of the mentioned
How do you check if a specific value is present in a dictionary?
a. value in d
b. d.contains(value)
c. d.has_value(value)
d. None of the above
Option a – value in d
Which method gives all the keys in one dictionary that do not exist in another?
c. Both (a) and (b)
d. None of the above
Option c – Both (a) and (b)
How do you obtain all values from one dictionary that are missing in another?
a. set(d1.values()) - set(d2.values())
b. set(d2.values()) - set(d1.values())
c. Both (a) and (b)
d. None of the above
Option c – Both (a) and (b)
How can you check whether a dictionary has no elements?
a. not d
b. d == {}
c. d.isEmpty()
d. All of the above
Option d – All of the above
What is the appropriate way to remove all items from a dictionary?
a. d.clear()
b. del d
c. d = {}
d. All of the mentioned
Option d – All of the mentioned
How can you retrieve a sorted list of keys that begin with a particular letter from a dictionary?
a. sorted((key for key in d.keys() if key[0] == "a"))
b. sorted(d.keys(), key=lambda x: x[0])
c. Both (a) and (b)
d. None of these
Option c – Both (a) and (b)
Which option correctly retrieves values from a dictionary that are above a given threshold, in descending order?
a. sorted([value for value in d.values() if value > 10], reverse=True)
b. sorted(d.values(), key=lambda x: x, reverse=True)
c. Both (a) and (b)
d. None of these
Option c – Both (a) and (b)
What is the correct approach to extract key-value pairs where the key matches a specific value, and sort them by their corresponding values?
a. sorted([(key, value) for key, value in d.items() if key == "a"], key=lambda x: x[1])
b. sorted(d.items(), key=lambda x: x[0])
c. Both (a) and (b)
d. None of these
Option a – sorted([(key, value) for key, value in d.items() if key == “a”], key=lambda x: x[1])
How can you list key-value pairs from a dictionary where the values exceed a certain number, sorted by keys in reverse order?
a. sorted([(key, value) for key, value in d.items() if value > 10], key=lambda x: x[0], reverse=True)
b. sorted(d.items(), key=lambda x: x[1], reverse=True)
c. Both (a) and (b)
d. None of these
Option a – sorted([(key, value) for key, value in d.items() if value > 10], key=lambda x: x[0], reverse=True)
Which method is used to copy entries from one dictionary to another, replacing existing entries with the same keys?
a. d1.update(d2)
b. d1.update(d2, overwrite=True)
c. d1.setdefault(d2, overwrite=True)
d. None of these
Option a – d1.update(d2)
Are Python dictionaries mutable data structures?
a. True
b. False
Option b – False
Which of the following loops can be used to go through the keys in a dictionary?
a. for key in dict:
b. for key in dict.keys():
c. for key, value in dict.items():
d. All of the above
Option d – All of the above
What function can be used to combine the contents of two dictionaries?
a. update()
b. merge()
c. combine()
d. None of the above
Option a – update()
What is the most efficient way to find out if a value exists in a dictionary?
a. Iterating over the dictionary and comparing each value
b. Using the in keyword
c. Using the values() method
d. Using the items() method
Option b – Using the in keyword
What occurs when you attempt to access a non-existent key in a dictionary using square brackets?
a. A KeyError exception is triggered
b. The result is None
c. A new key is added with a default value
d. It returns False
Option a – A KeyError exception is triggered
How can you check if a key exists in a dictionary without causing an error if it’s missing?
a. Loop through the dictionary
b. Use a try-except block
c. Use the in operator
d. Apply the contain method
Option c – Use the in operator
Which function removes a key and its associated value from a dictionary?
a. remove()
b. pop()
c. delete()
d. discard()
Option b – pop()
What method helps retrieve all the keys from a dictionary?
a. keys()
b. get_keys()
c. all_keys()
d. retrieve_keys()
Option a – keys()
What is the outcome of adding a new key-value pair to a dictionary if the key is already present?
a. The existing value is replaced
b. The new value is added to the old one
c. It throws a ValueError
d. It throws a KeyError
Option a – The existing value is replaced
Which method retrieves all the values stored in a dictionary?
a. get()
b. values()
c. items()
d. elements()
Option b – values()
How do you loop through both keys and values of a dictionary?
a. It isn’t possible to iterate over both at once
b. Use the items() method
c. Use the keys() method
d. Use nested loops
Option b – Use the items() method
Which statement correctly describes dictionary keys in Python?
a. Only integers are allowed as keys
b. Keys must be unique
c. Only strings can be used as keys
d. Keys are sorted by default
Option b – Keys must be unique
Which method allows you to insert a key-value pair into a dictionary only if the key is missing?
a. add()
b. insert()
c. setdefault()
d. append()
Option c – setdefault()
How does the get() method differ from using square brackets for accessing dictionary values?
a. get() provides a default value if the key is absent, while square brackets raise an error
b. get() throws an error when the key is missing, but square brackets do not
c. Both methods behave identically
d. Both methods generate an error when the key is missing
Option a – get() provides a default value if the key is absent, while square brackets raise an error
What is the purpose of the update() method in Python dictionaries?
a. Combines another dictionary into the current one
b. Changes the value of a specific key
c. Deletes a key-value pair
d. Organizes the dictionary in order
Option a – Combines another dictionary into the current one
How can you update the value tied to a certain key in a dictionary?
a. Use the set() method
b. Use the update() method
c. Assign a new value using square brackets []
d. Use the modify() method
Option c – Assign a new value using square brackets []
What does the values() method do in a Python dictionary?
a. It gives a list of all the values in the dictionary
b. It gives a list of all the keys in the dictionary
c. It tells the number of key-value entries in the dictionary
d. It organizes the dictionary values in ascending order
Option a – It gives a list of all the values in the dictionary
What is a reliable way to determine if a dictionary has no data?
a. Use the empty() method
b. Use the is_empty() method
c. Use the len() function and verify if the result is 0
d. Use the has_items() method
Option c – Use the len() function and verify if the result is 0
What does calling the copy() function on a dictionary accomplish?
a. Produces an entirely independent copy with all nested data
b. Creates a shallow duplicate of the dictionary
c. Generates a copy with reversed key-value order
d. Returns a sorted version of the original dictionary
Option b – Creates a shallow duplicate of the dictionary
Which method removes a specific entry from a dictionary?
a. remove()
b. delete()
c. discard()
d. pop()
Option d – pop()
When checking for the existence of a key in a dictionary using in, what is the lookup time?
a. O(1)
b. O(n)
c. O(log n)
d. O(n²)
Option a – O(1)
Why would you use the items() function with a dictionary?
a. To get all key-value pairs as a list
b. To retrieve a list of keys
c. To extract all values from the dictionary
d. To sort the dictionary by its keys
Option a – To get all key-value pairs as a list
Which method lets you access a dictionary value safely if you’re unsure the key exists?
a. get_value()
b. get()
c. value()
d. retrieve()
Option b – get()
What is a valid way to build a dictionary from two separate lists—one of keys and one of values?
a. Use the dict() function
b. Use the zip() function
c. Loop through both lists and add entries manually
d. It can’t be done using lists
Option b – Use the zip() function
How do you loop through just the keys in a dictionary?
a. Use for key in my_dict:
b. Use for key in my_dict.keys():
c. Use for key in my_dict.values():
d. You can’t loop through keys only
Option a – Use for key in my_dict:
What is the role of the popitem() method in dictionaries?
a. Deletes a specific key-value entry
b. Removes the first key-value entry
c. Eliminates the last inserted key-value pair
d. Clears every item from the dictionary
Option c – Eliminates the last inserted key-value pair
What is the role of the setdefault() method in Python dictionaries?
a. It assigns a default value to a specified key if the key is not already in the dictionary
b. It removes a key-value pair from the dictionary
c. It modifies the value of a specific key
d. It creates a duplicate of the dictionary
Option a – It assigns a default value to a specified key if the key is not already in the dictionary
How can you remove a key-value pair from a dictionary using the pop() method?
a. By specifying the value to be deleted
b. By specifying the key to be deleted
c. By specifying both the key and value to be deleted
d. By removing the last key-value pair
Option b – By specifying the key to be deleted
What does the copy() method do in Python dictionaries?
a. It makes a deep copy of the dictionary
b. It makes a shallow copy of the dictionary
c. It makes a reversed copy of the dictionary
d. It creates a sorted copy of the dictionary
Option b – It makes a shallow copy of the dictionary
What is the time complexity for removing a key-value pair from a dictionary using the pop() method?
a. O(1)
b. O(n)
c. O(log n)
d. O(n²)
Option a – O(1)
What is the function of the dict() constructor in Python?
a. It creates a new, empty dictionary
b. It creates a collection of key-value pairs
c. It converts a list of tuples into a dictionary
d. It creates a deep copy of an existing dictionary
Option c – It converts a list of tuples into a dictionary
How do you modify the value associated with a key in a dictionary using the update() method?
a. By passing the new value as an argument to the update() method
b. By using square brackets [] to directly assign the new value
c. By invoking the update() method with the new value
d. The update() method cannot be used to modify a specific key’s value
Option a – By passing the new value as an argument to the update() method
How can you create a dictionary with default values for keys that don’t exist, using a standard dictionary (without defaultdict)?
a. By using the default() method
b. By using a function like create_default_dict()
c. By iterating through the keys and setting default values manually
d. It is not possible to create a dictionary in this way
Option c – By iterating through the keys and setting default values manually
Which data structure is used to store the values in key-value pairs?
a. Set
b. Map
c. Dictionary
d. Tuple
Option c – Dictionary
In a dictionary, which part contains the unique elements?
a. Key
b. Pair
c. Both
d. None of the above
Option a – Key
How are dictionary elements stored?
a. (Dictionaries)
b. {}
c. []
d. All of the above
Option b – {}
In a dictionary, which symbol separates keys from values?
a. ,
b. ::
c. :
d. .
Option c – :
In a dictionary, which symbol is used to separate different elements?
a. ,
b. :
c. ;
d. .
Option a – ,
Which of the following is the correct syntax for creating a dictionary?
a. Dict = | 1: "hi", 2: "hello"]
b. Dict = (1: "hi", 2: "hello")
c. Dict = | 1 "hi", 2: "hello")
d. Dict = [1: "hi", 2: "hello"]
Option c – Dict = | 1 “hi”, 2: “hello”)
We covered all the Python Dictionary Operations MCQ for Beginners above in this post for free so that you can practice well for the exam.
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