On 25 August 2013 07:59, Tim Delaney wrote:
> Breakdown of the above (for 19 digits):
>
> d.as_tuple() takes about 35% of the time.
>
> The multiply and add takes about 55% of the time.
>
> The exponentiation takes about 10% of the time.
>
Bah - sent before complete.
Since the multiply and add
On 24 August 2013 13:30, Steven D'Aprano <
steve+comp.lang.pyt...@pearwood.info> wrote:
>
> def convert(d):
> sign, digits, exp = d.as_tuple()
> num = int(''.join([str(digit) for digit in digits]))
> if sign: num = -num
> return num, 10**-exp
>
> which is faster, but not fast enoug
Steven D'Aprano wrote:
> I have a need to convert arbitrary non-complex numbers into numerator/
> denominator pairs. Numbers could be ints, floats, Fractions or Decimals.
> For example:
>
> 2 => (2, 1)
> 0.25 => (1, 4)
> Fraction(2, 3) => (2, 3)
> Decimal("0.5") => (1, 2)
>
>
> The first three
On Sat, Aug 24, 2013 at 1:37 AM, Ian Kelly wrote:
>
> I time this function at about 33% faster than your version for a
> six-digit decimal, and almost 50% faster for a 12-digit decimal. My
> guess would be because it's not calling str() on every individual
> digit.
>
> def convert(d):
> exp =
On Fri, Aug 23, 2013 at 9:30 PM, Steven D'Aprano
wrote:
> Is there a fast way to convert a Decimal into a pair of numbers numerator/
> denominator? It *must* be exact, but it doesn't have to be simplest form.
> For example, Decimal("0.5") => (5, 10) would be okay, although (1, 2)
> would be prefer
I have a need to convert arbitrary non-complex numbers into numerator/
denominator pairs. Numbers could be ints, floats, Fractions or Decimals.
For example:
2 => (2, 1)
0.25 => (1, 4)
Fraction(2, 3) => (2, 3)
Decimal("0.5") => (1, 2)
The first three cases are easy and fast:
# ints and Fraction
