Python 2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)] on win32
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>>> 100+284
384
>>> 2000-1880.98
119.01999999999998
>>> 2000.0 - 1880.98
119.01999999999998
>>> 100-99.98
0.01999999999999602
>>> 100 - 1.65
98.35
>>> 100 - 90.98
9.019999999999996
>>> 100 - 1.98
98.02
>>> 100-99.99
0.010000000000005116
>>> 1 - 0.98
0.020000000000000018
>>> 1.0 - 0.5
0.5
>>> 1.0 - 0.98
0.020000000000000018
>>>