[issue12345] Add math.tau

[Nofar Schnider]

Nofar Schnider added the comment:

I agree with Raymond.
In my opinion, it doesn't seem like there is a need to add such a constant.
I know many of my previous and current colleagues would not use it (why should them if they can just write "2 * math.pi" ?)
It seems that the efforts to spread the word that Pi is wrong and Tau is right haven't "bear fruits". For now I don't think we should make such a strong stand in adding it.
If we do add new constants they should be of calculations that are harder and might ruin the code's visibility.
 
https://www.explainxkcd.com/wiki/images/0/08/pi_vs_tau.png

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nosy: +Nofar Schnider

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