On Mon, Oct 12, 2009 at 4:12 PM, Anand Chitipothu <anandol...@gmail.com> wrote: > On Mon, Oct 12, 2009 at 4:05 PM, Anand Balachandran Pillai > <abpil...@gmail.com> wrote: >> >> >> On Mon, Oct 12, 2009 at 4:02 PM, Anand Balachandran Pillai >> <abpil...@gmail.com> wrote: >>> >>> >>> On Mon, Oct 12, 2009 at 3:47 PM, Anand Chitipothu <anandol...@gmail.com> >>> wrote: >>>> >>>> On Mon, Oct 12, 2009 at 2:42 PM, Baiju Muthukadan <ba...@muthukadan.net> >>>> wrote: >>>> > http://bitcheese.net/wiki/nopython >>>> > >>>> > Don't start a flame war now, please ;) >>>> >>>> 2.3 - 3.4 and 2/3.0 in Python, Ruby and Haskell interpreters. >>>> >>>> $ python3.0 >>>> Python 3.0.1 (r301:69597, Feb 14 2009, 19:03:52) >>>> [GCC 4.0.1 (Apple Inc. build 5490)] on darwin >>>> Type "help", "copyright", "credits" or "license" for more information. >>>> >>> 2.3 - 3.4 >>>> -1.1000000000000001 >>>> >>> 2/3.0 >>>> 0.66666666666666663 >>>> >>>> $ irb >>>> >> 2.3 - 3.4 >>>> => -1.1 >>>> >> 2/3.0 >>>> => 0.666666666666667 >>>> >> ^D >>>> >>>> $ ghci >>>> GHCi, version 6.8.2: http://www.haskell.org/ghc/ :? for help >>>> Loading package base ... linking ... done. >>>> Prelude> 2.3 - 3.4 >>>> -1.1 >>>> Prelude> 2/3.0 >>>> 0.6666666666666666 >>>> Prelude> Leaving GHCi. >>>> >>>> It looks like number of decimal digits printed are 17 in Python, 16 in >>>> Haskell and 15 in Ruby. >>>> >>>> Is there any way to change that behavior in Python? >>> >>> Not in the interpreter AFAIK. In code, use Decimal type. >>> >>> import decimal >>> >>> x=decimal.Decimal('2.3') >>> >>> y=decimal.Decimal('3.4') >>> >>> x-y >>> Decimal("-1.1") >>> >>> I am not however a fan of the decimal module since it uses strings as the >>> base type. >> >> You do end up with quirks like the following however. >> >>> x=decimal.Decimal('2.3') >>>>> y=decimal.Decimal('3.4') >>>>> z=x-y >>>>> z >> Decimal("-1.1") >>>>> str(z) >> '-1.1' >>>>> z>(2.2-3.4) >> True >> >> ;-) >> >> Perhaps the "bitchy" blogger has a point w.r.t floating point handling. > > Not really. That is problem with floating point computation and not > with Python. Even that is same in Ruby. > > $ irb >>> 1.1 > (2.2-3.4) > => true >>> ^D
Opps. wrong example. _______________________________________________ BangPypers mailing list BangPypers@python.org http://mail.python.org/mailman/listinfo/bangpypers
