Mark Dickinson added the comment:

The code is behaving correctly. The surprise is due to the internal binary 
representation of Python floats, and is related to the documentation note about 
`round` here:

https://docs.python.org/3/library/functions.html#round

> The behavior of round() for floats can be surprising: for example, 
> round(2.675, 2) gives 2.67 instead of the expected 2.68. This is not a bug: 
> it’s a result of the fact that most decimal fractions can’t be represented 
> exactly as a float.

----------
nosy: +mark.dickinson
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30453>
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