Object Mentor Blog: Tuple Madness

Tuple Madness

tottinger — Tue, 13 Feb 2007 12:07:16 -0600

If there is a downside to modern OO languages like Python and Ruby it is the great built-in list types. They’re wonderful, but they’re tempting.

Today I had my fourth or fifth encounter with tuple madness. It seems that the siren song of “free” data structures with unnamed members is just too much to resist. I’ve decided to call it Tuple Madness. An example is: x = (2,3,-1) Could one be less descriptive? Probably not.

I came across some code which uses two-tuples where both values are encoded integer values. It’s a pain to figure out.

In a previous job, a coworker would write his python entirely as filters on n-tuples so that figuring out what his code was doing was really painful. A function would take a sequence of n-tuples, and return a sequence of n-tuples where some of the values were preserved (though reordered) from the input, and the rest were transformations on the input + some local data. It was really tough to read a program where the data structures had unnamed elements and only existed between the return of one function and the invocation of the next.

At least one of my colleagues has blogged about suffering from Tuple Madness as well.

I don’t think that “magic tuples” are always evil, only that they’re no substitute for proper objects and meaningful data structures.

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