[docs] [issue21929] Rounding properly

[Raymond Hettinger]

Raymond Hettinger added the comment:

FWIW, the FAQ in the decimal docs shows how to round Decimal objects using the quantize() method:  https://docs.python.org/2.7/library/decimal.html#decimal-faq

Unfortunately, only it Python 3 does the one-obvious-way-to-do-it work.

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nosy: +rhettinger

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<http://bugs.python.org/issue21929>
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