Someone found Yet Another Post (YAP™) insisting that the Gang of Four (GOF™) patterns were on their last legs. The email was misleading, because this is not precisely what the article said. The bottom-line was that Design Patterns in general are merely a response to gaps in the underlying programming …

Someone told me they weren't yet ready to write "serious code." They needed to spend more time doing something that's not coding.

I'm unclear on what they were doing. It appears they have some barriers that I can't see.

They had sample data. They had a problem statement. They had …

The conventional wisdom on class design is to model real-world things. This is the Domain-Driven Design Approach. It's what we used to teach as Rumbaugh's OMT (prior to the Three Amigos creating UML.)

The idea is simple: Look at the real world objects. Describe them. Classes will have attributes and …

New Kindle Edition of Building Skills in Object-Oriented Design.

It seems to work okay in my Kindle Readers.

I'm not sure it's really formatted completely appropriately. I'm not a book designer. But before I fuss around with font sizes, I think I need to spend some time on several more …

We'll be digging into Mastering Object-Oriented Python. Chapter 17, specifically.

We'll also be looking at a big refactoring of the Stingray Schema-Based File Reader.

We can identify three species of packages.

One common design is a Simple Package. A directory with an empty __init__.py file. This package name becomes …

• 0 Some Preliminaries 3 examples, 56 lines
• 1 The __init__() Method 55 examples, 351 lines
• 2 Integrating Seamlessly …

See this: SortedContainers — sortedcontainers 0.6.0 documentation

Here's some text from the invitation.

You may find the the performance comparison and implementation details interesting because it doesn't use any sophisticated tree data structure or balancing algorithms. It's a great example of taking advantage of what processors are good at …

Read this http://en.wikipedia.org/wiki/Einstellung_effect Great article in Scientific American on this.

I didn't realize that sometimes I do spend time trying to defeat the Einstellung effect. Not a lot of time. But some time.

When confronted with gnarly design problems, I have the same bad habits …

Epiphany.

In Python, with iterators, the Visitor design pattern is useless. And a strongly-ingrained habit. Which I'm trying to break.

Here's a common Visitor approach:

class Visitor:
    def __init__( self ): ...
    def visit( self, some_target_thing ): ...
    def all_done( self ): ...

v = Visitor()
for thing in some_iterator():
    v.visit(thing)
v.all_done()

If we …

Check out this month's Hacker Monthly. One of my Stackoverflow answers was reswizzled into a short article on class design. That was gratifying.