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Module 025: Mutability vs Immutability

Phase: 3. Data Structures
Estimated Time: 1.5 hours
Milestone: No

Overview

Understand the critical distinction between mutable and immutable types in Python, and how this affects assignment, function calls, and data structure usage.

Topics

  • Mutable types: list, set, dict
  • Immutable types: int, float, str, tuple, frozenset
  • How mutability affects assignment and function calls
  • Why it matters for dict keys and set elements
  • Memory/reference model explanation

Learning Objectives

  • Identify which Python types are mutable and which are immutable
  • Predict how mutability affects variable assignment
  • Explain why mutable types cannot be dictionary keys or set elements
  • Understand the memory/reference model
  • Avoid mutability-related bugs in function arguments

Prerequisites

  • Modules 000–024

Next Module

Module 026: Working with Collections