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[Python-Dev] PEP: New timestamp formats
Paul Moorep.f.moore at gmail.com
Thu Feb 2 13:45:34 CET 2012
On 2 February 2012 12:16, Victor Stinner <victor.stinner at haypocalc.com> wrote:> Let's take an NTP timestamp in format (c): (sec=0,> floatpart=100000000, divisor=2**32):>>>>> Decimal(100000000) * Decimal(10)**-10> Decimal('0.0100000000')>>>> Decimal(100000000) / Decimal(2)**32> Decimal('0.023283064365386962890625')>> You have an error of 57%. Or do you mean that not only 2**32 should be> modified, but also 100000000? How do you adapt 100000000 (floatpart)> when changing the divisor (2**32 => 10**-10)? The format (c) avoids an> operation (base^exponent) and avoids loosing precision.Am I missing something? If you're using the fixed point form(fraction, exponent) then 0.023283064365386962890625 would be writtenas (23283064365386962890625, -23). Same precision as the (100000000,base=2, exponent=32) format.Confused,Paul
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