On Sat, 11 Aug 2007 16:40:02 +0000, Adam W. wrote:
> After a fair amount of troubleshooting of why my lists were coming
> back a handful of digits short, and the last digit rounded off, I
> determined the str() function was to blame:
>
>>>> foonum
> 0.0071299720384678782
>>>> str(foonum)
> '0.00712997203847'
>>>>
>
> Why in the world does str() have any business rounding my numbers, and
> how do I get around this?
If `str()` would not round you would get very long numbers because of the
inaccuracies of floating point values. I know Python is lying when 0.1
prints as 0.1, but do you really want to see
0.10000000000000000555111512312578270211815834045410156250 instead?
Use string formatting to tell the number of digits you want to see:
In [16]: '%.56f' % 0.1
Out[16]: '0.10000000000000000555111512312578270211815834045410156250'
Ciao,
Marc 'BlackJack' Rintsch
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