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A demonstration of classes and their special methods in Python.
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dS(uVecuwA simple vector class.

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    added
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    Vec(4, 4, 4)

    subtracted
    >>> a - b
    Vec(-2, 0, 2)

    and multiplied by a scalar on the left
    >>> 3.0 * a
    Vec(3.0, 6.0, 9.0)

    or on the right
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    Vec(3.0, 6.0, 9.0)
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