numbers - Where to use decimal.ROUND_05UP in Python? -

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the decimal module in python provides option rounding decimal:

round_05up

what practical uses type of rounding?

the ieee decimal arithmetic spec has it:

the rounding mode round-05up permits arithmetic @ shorter lengths emulated in fixed-precision environment without double rounding. example, multiplication @ precision of 9 can effected carrying out multiplication @ (say) 16 digits using round-05up , rounding required length using desired rounding algorithm.

in other words, if round 1 precision using round_05up , round shorter precision using other rounding mode, result same if had directly rounded shorter precision.


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