"Neven Gorsic" <neven.gor...@gmail.com> wrote
I run into Python error in rounding and not know how to predict when
it will
occur in order to prevent wrong result.
It depends how you define wrong. When I was at scvhool the rules f
or rounding decimals said that if it ended in 5 you rounded to the
nearest even digit.
So 0.45 -> 0.4 and 0.55 ->0.6
But you seem to assume a 5 always rounds up...
What can I do to assure accurate result?
Just to be picky, Python is being accurate, but it is
accurately reflecting the binary value... But I think
you knew that! :-)
"%.2f" % 0.465
'0.47' correct
"%.2f" % 0.475
'0.47' not correct
"%.2f" % 0.485
'0.48' not correct
The good news is that python's round() function seems
to have had the same teacher as you :-)
So
"%.2f" % round(0.475,2)
'0.48'
"%.2f" % round(0.485, 2)
'0.49'
HTH,
Alan G.
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