Decimal arithmatic, was Re: Python GUI app to impress the boss?

[Paul Rubin]

"James J. Besemer" <jb at cascade-sys.com> writes:
> >>>>(.70 * .05) + .000000001
> >>>>
> >
> >rounds to the right thing.
> >
> Nope.  It helps in some cases but introduces errors in other cases
> (e.g., negative numbers).

OK, fix the rounding direction:

    def round(x):
      if x < 0: sign = -1.0
      else: sign = 1.0
      return sign * (abs(x) + .00000001)