Abstract Base Classes and Properties in Python: A DRY Way to Enforce Validation

📰 Medium · Python

Learn how to use abstract base classes and properties in Python to enforce validation and keep your code DRY

intermediate Published 11 Apr 2026
Action Steps
  1. Create an abstract base class using the abc module in Python to define a contract for subclasses
  2. Use the @property decorator to define properties that can enforce validation and keep state centralized
  3. Implement validation logic in the property setter to ensure data integrity
  4. Use subclassing to create specific implementations that inherit the validation logic from the abstract base class
  5. Apply this pattern to real-world problems to keep your code DRY and maintainable
Who Needs to Know This

Software engineers and developers can benefit from this knowledge to write more efficient and maintainable code

Key Insight

💡 Abstract base classes can do more than just define behavior, they can also centralize shared state and enforce invariants

Share This
Use abstract base classes and properties in Python to enforce validation and keep your code DRY #python #drycode

Key Takeaways

Learn how to use abstract base classes and properties in Python to enforce validation and keep your code DRY

Full Article

Title: Abstract Base Classes and Properties in Python: A DRY Way to Enforce Validation

URL Source: https://medium.com/@virtualik/abstract-base-classes-and-properties-in-python-a-dry-way-to-enforce-validation-059e1260e853?source=rss------python-5

Published Time: 2026-04-11T19:10:25Z

Markdown Content:
# Abstract Base Classes and Properties in Python: A DRY Way to Enforce Validation | by Vitaly Sem | Apr, 2026 | Medium

[Sitemap](https://medium.com/sitemap/sitemap.xml)

[Open in app](https://play.google.com/store/apps/details?id=com.medium.reader&referrer=utm_source%3DmobileNavBar&source=post_page---top_nav_layout_nav-----------------------------------------)

Sign up

[Sign in](https://medium.com/m/signin?operation=login&redirect=https%3A%2F%2Fmedium.com%2F%40virtualik%2Fabstract-base-classes-and-properties-in-python-a-dry-way-to-enforce-validation-059e1260e853&source=post_page---top_nav_layout_nav-----------------------global_nav------------------)

[](https://medium.com/?source=post_page---top_nav_layout_nav-----------------------------------------)

Get app

[Write](https://medium.com/m/signin?operation=register&redirect=https%3A%2F%2Fmedium.com%2Fnew-story&source=---top_nav_layout_nav-----------------------new_post_topnav------------------)

[Search](https://medium.com/search?source=post_page---top_nav_layout_nav-----------------------------------------)

Sign up

[Sign in](https://medium.com/m/signin?operation=login&redirect=https%3A%2F%2Fmedium.com%2F%40virtualik%2Fabstract-base-classes-and-properties-in-python-a-dry-way-to-enforce-validation-059e1260e853&source=post_page---top_nav_layout_nav-----------------------global_nav------------------)

![Image 1](https://miro.medium.com/v2/resize:fill:32:32/1*dmbNkD5D-u45r44go_cf0g.png)

# Abstract Base Classes and Properties in Python: A DRY Way to Enforce Validation

[![Image 2: Vitaly Sem](https://miro.medium.com/v2/resize:fill:32:32/1*XKfKp-F8adZq8MGxpQ_XPQ.jpeg)](https://medium.com/@virtualik?source=post_page---byline--059e1260e853---------------------------------------)

[Vitaly Sem](https://medium.com/@virtualik?source=post_page---byline--059e1260e853---------------------------------------)

Follow

7 min read

·

1 hour ago

[](https://medium.com/m/signin?actionUrl=https%3A%2F%2Fmedium.com%2F_%2Fvote%2Fp%2F059e1260e853&operation=register&redirect=https%3A%2F%2Fmedium.com%2F%40virtualik%2Fabstract-base-classes-and-properties-in-python-a-dry-way-to-enforce-validation-059e1260e853&user=Vitaly+Sem&userId=6624c5578df7&source=---header_actions--059e1260e853---------------------clap_footer------------------)

[](https://medium.com/m/signin?actionUrl=https%3A%2F%2Fmedium.com%2F_%2Fbookmark%2Fp%2F059e1260e853&operation=register&redirect=https%3A%2F%2Fmedium.com%2F%40virtualik%2Fabstract-base-classes-and-properties-in-python-a-dry-way-to-enforce-validation-059e1260e853&source=---header_actions--059e1260e853---------------------bookmark_footer------------------)

[Listen](https://medium.com/m/signin?actionUrl=https%3A%2F%2Fmedium.com%2Fplans%3Fdimension%3Dpost_audio_button%26postId%3D059e1260e853&operation=register&redirect=https%3A%2F%2Fmedium.com%2F%40virtualik%2Fabstract-base-classes-and-properties-in-python-a-dry-way-to-enforce-validation-059e1260e853&source=---header_actions--059e1260e853---------------------post_audio_button------------------)

Share

> Python developers usually meet abstract base classes in a familiar role: define a contract, force subclasses to implement required methods, and keep the design explicit.

Press enter or click to view image in full size

![Image 3](https://miro.medium.com/v2/resize:fit:700/1*t8M1UEbScg91MwDUZfQJjQ.png)

That is useful, but it is only half the story.

An abstract base class can do much more than describe behavior. It can also centralize shared state, enforce invariants, and keep validation logic from being copy-pasted across subclasses. Once properties enter the picture, that becomes especially powerful.

In this article, I wan
Read full article → ← Back to Reads