Re: gmpy adapter

From: Daniele Varrazzo <daniele(dot)varrazzo(at)gmail(dot)com>
To: Daniel Popowich <danielpopowich(at)gmail(dot)com>
Cc: psycopg(at)postgresql(dot)org
Subject: Re: gmpy adapter
Date: 2011-03-01 10:19:55
Message-ID: AANLkTi=GQM4CLxEZj9ugJ=m1GmDNQZa608tEkqeuAZJ9@mail.gmail.com
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On Mon, Feb 28, 2011 at 11:07 PM, Daniele Varrazzo
<daniele(dot)varrazzo(at)gmail(dot)com> wrote:

> Also notice that float64 has 53 bits of precision, 15 full decimal
> digits. If you don't need more precision when you write data in the
> database (even if you have used more during calculations) you may just
> use the repr(float()) of your mpq to write into the database.

Or else, in the adapter you may use mpf to approximate the rational to
the precision you need.

>>> gmpy.mpq(2,3)
mpq(2,3)
>>> gmpy.mpf(_, 100)
mpf('6.666666666666666666666666666666666666667e-1',100)
>>> str(_)
'0.6666666666666666666666666666666666666667'

-- Daniele

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