Which set is different?

Question: Which of the following data types in Python is immutable?

Options:

    
• A) List
    
• B) Dictionary
    
• C) Tuple
    
• D) Set

Correct Answer: C) Tuple

Detailed Explanation:

An immutable object is an object whose state or contents cannot be modified after it is created. In contrast, a mutable object allows in-place modifications (such as adding, updating, or removing elements).

Breakdown of the options:

    
• Tuple (Correct): Tuples are defined using parentheses (). Once a tuple is declared, its elements cannot be reassigned, added, or removed. This makes tuples fixed in size and immutable.
    
• List (Incorrect): Lists are defined with square brackets [] and are fully mutable. You can modify their items using methods like .append(), .remove(), or index assignment (e.g., lst[0] = 5).
    
• Dictionary (Incorrect): Dictionaries are key-value mappings defined with curly braces {}. They are mutable, allowing keys and values to be added, changed, or deleted dynamically.
    
• Set (Incorrect): Sets are unordered collections of unique elements. While elements within a set must be hashable, the set itself is mutable and elements can be added with .add() or removed with .remove().

Key Takeaway: In Python, common immutable types include int, float, bool, str, tuple, and frozenset.