Floating point multiplication in python

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Tue Sep 6 01:57:31 EDT 2011

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hi all:

As we know ,  1.1 * 1.1 is 1.21 . 
But in python ,I got following :

>>> 1.1 * 1.1
1.2100000000000002

why python get wrong result? Who can tell me  where's the 0.0000000000000002 from?

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