I think what your experiencing is addressed on this page... http://docs.python.org/tutorial/floatingpoint.html
... it has to do with the binary representation of the numbers. On Thu, Jun 25, 2009 at 1:04 PM, Bojan Sudarevic <bo...@sudarevic.com>wrote: > Hi, > > I'm PHP developer and entirely new to Python. I installed it (version > 2.5.2, from Debian repos) today on the persuasion of a friend, who is a > Python addict. > > The first thing I typed into it was 3.2*3 (don't ask why I typed *that*, > I don*t know, I just did). And the answer wasn't 9.6. > > Here it is: > > >>> 3.2*3 > 9.6000000000000014 > > So I became curious... > > >>> 3.21*3 > 9.629999999999999 > >>> (3.2*3)*2 > 19.200000000000003 > ... and so on ... > > After that I tried Windows version (3.1rc2), and... > > >>> 3.2*3 > 9.600000000000001 > > I wasn't particularly good in math in school and university, but I'm > pretty sure that 3.2*3 is 9.6. > > Cheers, > Bojan > -- > http://mail.python.org/mailman/listinfo/python-list >
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