OOP — Actors and Plays

The first object-oriented programming assignment: building two classes (Actor and Play) that demonstrate the basics of Python OOP — attributes, getters and setters with validation, composition, and __str__.

What this assignment covers

• Defining a class with __init__ and instance attributes
• Writing getter methods (get_name, get_age, …) and setter methods (set_name, set_age, …)
• Adding validation inside setters (reject negative ages, non-positive heights, runtimes ≤ 0, and years before 1400) and printing a warning instead of updating
• Composition — a Play holds an Actor object as its lead_actor
• Implementing __str__ so print(obj) produces human-readable output
• Using the if __name__ == "__main__": idiom to keep demo code separate from class definitions

What's in the file

• Actor — fields: name (str), age (int), height (float). Setters validate age and height before assigning.
• Play — fields: title, lead_actor (an Actor), length_min, year. Setters validate length_min > 0 and year >= 1400. Its __str__ includes the lead actor's info, demonstrating that printing a composed object cascades through to the inner object's __str__.

The main block demonstrates the full lifecycle: creating two actors, building two plays around them, printing each play, updating an attribute via a setter and reprinting, and triggering the validation warning by attempting an invalid update.

How to run

python assignment.py

Notes

The assignment description lives in ASSIGNMENT.md. No external dependencies — pure standard-library Python 3.

This assignment is the prerequisite for the Inheritance — Performers and Productions project, which generalizes Actor into a Performer base class with three specialized subclasses.