Sets, Dictionaries, and Tuples in Python

What is a key characteristic of a set in Python?

• Allows duplicate values

• Stores key-value pairs

• Stores unique elements

• Is immutable

Which method is used to add an item to a set?

• append()

• add()

• insert()

• update()

What happens if you try to access a key that does not exist in a dictionary?

• Returns None

• Raises a KeyError

• Returns an empty string

• Creates a new key with a default value

What data structure is best suited for storing unique visitors to a website?

• List

• Dictionary

• Set

• Tuple

What is the output of the following code? fruits = {"apple", "banana", "cherry"} fruits.add("apple") print(len(fruits))

• 4

• 3

• 2

• Error

Which of the following is an immutable data structure?

• List

• Dictionary

• Tuple

• Set

How can you update the value of an existing key in a dictionary?

• Using the update() method

• Assigning a new value to the key

• Using the add() method

• Both a and b

What is a key in a dictionary?

• A unique identifier used to access a value

• The actual data stored in the dictionary

• A method to retrieve values

• An index position in the dictionary

What will happen if you attempt to modify an element in a tuple?

• The element will be modified successfully

• The element will be appended at the end

• A TypeError will be raised

• The element will be replaced

Which of the following methods removes a key-value pair from a dictionary?

• remove()

• pop()

• discard()

• delete()