math module for Decimals

Mark Dickinson dickinsm at gmail.com
Sun Dec 28 15:38:32 CET 2008


On Dec 28, 7:28 am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> Ah crap, I forgot that from_float() has been left out of the decimal API.
> That's very annoying.

Agreed.  It's maybe even annoying enough that a feature request
at bugs.python.org might be honoured.  (Hint, hint!)

It's fairly easy to emulate in Python 2.6 and above, using the
as_integer_ratio float method:

>>> from decimal import Decimal
>>> from math import pi
>>> n, d = pi.as_integer_ratio()
>>> Decimal(n)/d
Decimal('3.141592653589793115997963469')

Mark



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