for with decimal values?
J. Cliff Dyer
jcd at sdf.lonestar.org
Tue May 5 13:11:43 EDT 2009
On Sun, 2009-05-03 at 19:48 -0700, alex23 wrote:
> On May 4, 11:41 am, Esmail <ebo... at hotmail.com> wrote:
> > All this discussion makes me wonder if it would be a good idea
> > for Python to have this feature (batteries included and all) - it
> > would have its uses, no?
> Well, sometimes more discussion == less consensus :)
> But it's really easy to roll your own:
> from decimal import Decimal
> def args2dec(fn):
> '''*args to Decimal decorator'''
> float2dec = lambda f: Decimal(str(f))
> def _args2dec(*args):
> args = map(float2dec, args)
> return fn(*args)
> return _args2dec
> def drange(start, stop, step):
> while start < stop:
> yield start
> start += step
I'd prefer not to force my users into using the Decimal type. Maybe
float fits their needs better. So here's a generalized xrange
replacement, which fixes an error in the drange implementation above
(try it with a negative step). It's also highly *not* optimized.
Calculating i * step every time slows it down. Speeding it back up is
an exercise for the reader.
def general_xrange(start, stop, step=1):
target = stop * step
if start * step > target:
i = start
while i * step < target:
i += step
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