Programming #9: Style and Testing

We would be remiss in our study of programming if we did not devote some time to the crafting of quality code. This subject can be a bit subjective and many programmers have a dogmatic attachment to what they believe qualifies as quality code. Luckily for us, some standards have emerged. The Python Enhancement Proposal (PEP 8) is the go-to style guide for Python code. The Google Python Style Guide is another great resource. For an interactive guide, consider Code Like a Pythonista.

This post will go through an example of crafting readable code to solve a problem. The code can be found on Github. We will stick to some best practices as summarized nicely in the Zen of Python:

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren’t special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one—and preferably only one—obvious way to do it.
Although that way may not be obvious at first unless you’re Dutch.
Now is better than never.
Although never is often better than right now.
If the implementation is hard to explain, it’s a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea—let’s do more of those!

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