OOP in Python

Summary

Classes, objects, inheritance and dunder methods — most ML libraries (scikit-learn estimators, PyTorch modules) are built around this object model, so reading their source requires it.

• 1Build a small class hierarchy (e.g. Shape → Circle, Square) to practice inheritance.
• 2Read the source of a simple scikit-learn estimator to see OOP conventions in practice.
• 3Learn `__init__`, `__call__` and `__repr__` — the dunder methods you'll see constantly in PyTorch code.