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Sun Sep 30 09:25:48 CEST 2012 · https://mail.python.org/pipermail/python-dev/2012-September/121873.html

Stefan Krah <stefan at bytereef.org> wrote:
> Precision: 19 decimal digits
> 
> float:
> result: 3.1415926535897927
> time: 0.112874s
> 
> cdecimal:
> result: 3.141592653589793236
> time: 0.348100s
> 
> decimal:
> result: 3.141592653589793236
> time: 43.241220s

Apparently there were concerns about the correctness of the result on some
message board. To be clear: This is a *benchmark* designed to execute the
same code for float, cdecimal and decimal.

The *original* algorithm from the decimal docs uses a higher intermediate
context precision. Since floats do not have such a context, this step was
deliberately dropped from the benchmark.

Stefan Krah

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