[issue33089] Add multi-dimensional Euclidean distance function to the math module

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

Ah wait, I appear to have misunderstood Raymond's request. Sorry Raymond!

(I've been spending too much time teaching Pythagoras' theorem and my mind was primed to go directly from Euclidean distance to hypotenuse.)

Not withstanding my misunderstanding, if hypot supported arbitrary number of arguments, then the implementation of distance could simply defer to hypot:

def distance(p, q):
    # TODO error checking that p and q have the same number of items
    return hypot(*(x-y for x,y in zip(p, q)))


giving results like this:

py> distance((11, 21), (14, 17))
5.0


In either case, I agree with Raymond that this would be a useful feature.

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<https://bugs.python.org/issue33089>
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