Check this out.

SOLID Coding in Python by Mattia Cinelli.

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This was fun to read. It has some nice examples.

I submit that the order of presentation (S, O, L, I, D) is misleading. The acronym is fun, but awkward.

My …

The SOLID design principles beat the design boundary issue to death. Here are the principles in my preferred order. (See https://www.linkedin.com/learning/learning-s-o-l-i-d-programming-principles)

1. Interface Segregation -- minimize the boundaries. Do this first.
2. Liskov Substitution -- keep the boundaries consistent. Do this for hierarchies.
3. Open/Closed -- keep the boundaries stable …

Sometimes we call them "Belt and Braces" solutions. As a former suspenders person who switched to belts, the idea of wearing both is a little like over-engineering. In the unlikely event of catastrophic failure of one system, your pants can still remain properly hoist. There's a weird, but defensible reason …

For Python Programmers: SOLID Programming Principles https://www.lynda.com/trial/StevenLott should get your a discount on all Lynda.com courses. Feel free to share the links.