> [Guido]
> > It looks like if you pass in a context, the Decimal constructor
> > still ignores that context:
> >
> > >>> import decimal as d
> > >>> d.getcontext().prec = 4
> > >>> d.Decimal("1.2345678901234567890123456789012345678901234567890000",
> > d.getcontext())
> > Decimal("1.2345678901234567890123456789012345678901234567890000")
> > >>>
> >
> > I think this is contrary to what some here have claimed (that you
> > could pass an explicit context to cause it to round according to the
> > context's precision).[Tim] > I think Michael Chermside said that's how a particular Java > implementation works. > > Python's Decimal constructor accepts a context argument, but the only > use made of it is to possibly signal a ConversionSyntax condition. You know that, but Raymond seems confused. From one of his posts (point (k)): "Throughout the implementation, the code calls the Decimal constructor to create intermediate values. Every one of those calls would need to be changed to specify a context." But passing a context doesn't help for obtaining the desired precision. PS I also asked Cowlishaw and he said he would ponder it over the weekend. Maybe Raymond can mail him too. ;-) -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
