[issue12345] Add math.tau

[Aaron Meurer]

Aaron Meurer added the comment:

If this is implemented, it would be (as far as I can tell) the only thing in the math module that isn't also implemented in any of the standard external math libraries. None of numpy, scipy, sympy, or mpmath implement tau (if I'm missing one that others think is equally important to the ecosystem, let me know).

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<http://bugs.python.org/issue12345>
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