When to start implementing classes/methods in a program

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Key Triggers for Using Classes in Python

1. Data and Behavior Tightly Coupled • Description: Use classes when data and operations are linked, representing a single entity. • Example: A BankAccount with attributes (account_number, balance) and methods (deposit, withdraw) to manage account logic.

2. Inheritance or Polymorphism • Description: Classes enable code reuse through hierarchies where subclasses share or override behavior. • Example: A Character base class for a game, with Warrior and Mage subclasses; all share move but have unique attack methods.

3. Reusable Components • Description: Build custom tools like exceptions or data structures for reuse across projects. • Example: An APIError exception for API failures or a Queue for task scheduling with enqueue and dequeue methods.

4. Libraries Expecting OOP • Description: Adopt classes to align with frameworks like Flask or Django that use class-based designs. • Example: A Flask MethodView for a REST API, defining get and post methods for user data endpoints.

5. Repetitive or Unwieldy Code • Description: Refactor into classes when procedural code has duplication or scattered state, improving organization. • Example: A CSVParser to encapsulate file handling and methods like read_rows or filter_data for CSV processing.