On Mon, Oct 12, 2009 at 4:06 PM, Anand Balachandran Pillai < abpil...@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 >> >> Oops, I meant, > > >>> z>(2.3-3.4) > True > > Hmmm... apparently comparison with floats are not implemented for this type, so the above is not surprising.. Example. # This is clearly false >>> z>-1.0 True But, # That is better! >>> z>decimal.Decimal("-1.0") False > -- --Anand
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