On Mon, 9 Aug 2004 10:48:44 -0700, Andrew P. Lentvorski, Jr. wrote: > On Aug 9, 2004, at 10:29 AM, Mark Hahn wrote: > >> Forgive me if I'm being a pest, but no one has commented on the real >> reason >> I asked the question. What does everyone think of the idea of having >> these >> three built-in numeric types? >> >> 1) An Int implemented with infinite precision integer (Python Longs) >> with >> the constant/__str__ form of +-NN such as 0, -123, 173_394, etc. >> >> 2) A Decimal implemented with the .Net decimal float (or the IBM >> decimal if >> the .Net decimal sucks too much) with the constant/__str__ form of >> +-NN.NN >> such as 0.0, -123.0, 173_394.0, 173394.912786765, etc. >> >> 3) A binary Float implemented with the hardware floating point with the >> constant/__str__ form of +-NN.NN+-eNN such as 0e0, -123e0, 173.39e+3, >> 2.35e-78, etc. > > Be careful defining string representations of numbers. It is a > non-trivial > problem to adhere to the correct internationalization standards. > > Forgive me if I'm being dense, but don't we already have 1 & 3 as built > in types? There is no "we". This thread is about Prothon which has nothing yet since it hasn't ever been released. Your feedback is still relevant and helpful though. > 2 is unlikely to be a builtin until folks get some experience using the > Decimal module. Yes, the .Net Decimal sucks. > > In addition, the desired evolution of Python seems to be replacing the > binary floating point as the default floating point type with the > decimal floating point type by default rather than growing another > builtin numeric type. This is obviously contingent upon the Decimal > module > getting some real-life use as well as it getting some speed improvements > in the future. > >> There would be no automatic conversion except the / operator would >> convert >> from Int to Decimal > > Int goes to the default type of float (which is currently binary FP) > already > upon using the / operator. > >> and the Math module would convert Int and Decimal >> values to Float for almost all functions (except simple ones like abs, >> min, >> max). > > This is not necessarily a good idea. Exponentials are very useful in > financial situations and want to be decimals, not binary floats, in > those > cases. Good point.
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