Master Python Classes and Objects with Real‑World House Building Analogies

This article, originally shared on Zhihu, explains Python classes and objects for beginners using a concrete house‑building analogy and a series of visual diagrams.

Class and Object Analogy

A class is compared to a construction blueprint, while an object represents the finished house built from that blueprint.

Just as a blueprint contains all details of a house—layout, rooms, and features—Python’s class defines the structure and behavior of its instances.

Variable Assignment as Object Creation

When you write a = 2 and press Enter, Python activates the built‑in integer class . The integer class creates an object representing the value 2 , and the name a becomes a label that references this object.

Each time an object is created, it receives a unique ID. If you later assign b = 3 , a new integer object 3 is created and b points to it.

Object Identity and Reuse

If you assign b = 2 after a = 2 , Python does not create a new integer object; instead, b is bound to the same object that a already references, demonstrating object reuse and identity sharing.

Key Takeaways

In Python, everything is an object. Variable names are merely labels that reference objects, not containers that hold values. Understanding this distinction clarifies how classes, objects, and identity work together, making object‑oriented programming more intuitive.

With this mental model, writing object‑oriented code becomes much smoother.