Lets look at my favorite OO-Design problem domain: card games.

We'll compare the design of two games: Cribbage and Canasta.

Why? Because they have three common abstractions: cards, hands, and a score.

Overall the player's are dealt cards, form hands, and at some point, accumulate a score. Of course, all …

The back-story. See Coping With Complexity. See https://github.com/cloud-custodian/cel-python for the code base.

Back around May 26, I created this branch. Today -- July 2 -- I've got the tests to pass.

The back-story. See Coping With Complexity. See https://github.com/cloud-custodian/cel-python for the code base.

I've reached the point where progress is clearly impossible. A bad decision a few weeks ago has reached it's inevitable conclusion. I've made a terrible mistake. About 1,000 lines of code -- and tons …

I'm struggling with brain cramps trying to understand something my past self wrote. Current me needs to go outside and do something that doesn't involve software or complexity. Sadly, current me is trying to make one small change and it feels like the software has passed out of the realm …

I'm undecided if this goes into the next book. Maybe this is a teaser... And yes, this is a Python to the Rescue story.

I live on a boat. See Red Ranger Blog for details. What's essential is this little complication.

The South Gulf Cove Boat Lock.

The lock keeps …

Check this out.

SOLID Coding in Python by Mattia Cinelli.

Download Medium on the App Store or Play Store

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 …

Consider the following code

def max(m: int, n: int) -> int:
    if m >= n:
        return m
    elif n >= m:
        return n
    else:
        raise Exception(f"Design Error: {vars()}")

There's a question about else: clause and the exception raised there.

• It's impossible. In this specific case, a little algebra can provide …

In the mailbag I found this nonsense, doomed to inevitable failure:

"As I get more serious about this data science stuff, it has become obvious that a windows machine is not the way to go. ... Q1: What other things should I think about and consider while shopping for a new …