[docs] python calculate error

[琪]

I just test the version 2.7.10 and 3.5.2, on windows 7 SP1 x86, windows 7 SP1 x64 and linux debian amd64.
I hope can get the answer from you quickly, thanks.


18.35 - 9.35
9.000000000000002


18.35 - (12 - 2.65)
9.000000000000002









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