Comment 30 for bug 707923

Marco,
please read,
http://docs.python.org/tutorial/floatingpoint.html#tut-fp-issues

Other surprises follow from this one. For example, if you try to round the value 2.675 to two decimal places, you get this
>>> round(2.675, 2)
2.67
The documentation for the built-in round() function says that it rounds to the nearest value, rounding ties away from zero. Since the decimal fraction 2.675 is exactly halfway between 2.67 and 2.68, you might expect the result here to be (a binary approximation to) 2.68. It’s not, because when the decimal string 2.675 is converted to a binary floating-point number, it’s again replaced with a binary approximation, whose exact value is
2.67499999999999982236431605997495353221893310546875
Since this approximation is slightly closer to 2.67 than to 2.68, it’s rounded down.