The last two Simple Tricks posts looked at subclasses of built-in Python classes, in particular the tuple class, as well as the built-in class methods Python supports for any user-defined class. [See Simple Tricks #10 and Simple Tricks #11.]

This time I narrow the focus to real and virtual object attributes, the “x”, “y”, “z” elements of our vector objects. Python offers many ways to implement these, depending (as always) on what you want.

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