Weird arithmetic in Python

[yminsky at cs.cornell.edu]

Can anyone explain the following behavior of Python?  I understand that
floating point arithmetic is not identical to real arithmetic, but this
seems a bit odd.

Python 1.5.2 (#1, Aug 25 2000, 09:33:37)  [GCC 2.96 20000731
(experimental)] on linux-i386
Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
>>> .1 * 2 - .2
0.0
>>> .1 * 3 - .3
5.55111512313e-17
>>>

Yaron Minsky


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