On 8/10/2007 7:39 PM, tomamil wrote: > i know this example is stupid and useless, but that's not the answer > to my question. > here it goes: > > status = 0.0 > for i in range(10): > status = status + 0.1 > [snip]
0.1 can not be represented exactly as a binary floating-point number. to see what is really happening, use repr(), e.g. like this: >>> t = 0.0 >>> for i in range(10): ... t += 0.1 ... print i, t, repr(t) ... 0 0.1 0.10000000000000001 1 0.2 0.20000000000000001 2 0.3 0.30000000000000004 3 0.4 0.40000000000000002 4 0.5 0.5 5 0.6 0.59999999999999998 6 0.7 0.69999999999999996 7 0.8 0.79999999999999993 8 0.9 0.89999999999999991 9 1.0 0.99999999999999989 >>> Read this: http://docs.python.org/tut/node16.html HTH, John -- http://mail.python.org/mailman/listinfo/python-list
