[docs] BUG: A wrong result of computation in python2.6

[matthew chao]

version: Python 2.6
OS : Windows 7

The variable x below should have been 10(integer) after the expression
evaluates. It ,however, gets the value 10.000000000000002 (float) , as
follows,
--------------------------------------------
>>> x=math.exp ( math.log(10.0))
>>> x
10.000000000000002


>>> x=math.exp ( math.log(10))
>>> x
10.000000000000002
--------------------------------------------

In mathematics, the result is not right.
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