round function error???

[Terry Reedy]

Anthony wrote:
> Isn't this a mistake???
> 
>>>> round(3499.349439034,44)
> 3499.3494390340002
>>>> round(_,2)
> 3499.3499999999999
>>>> round(_,1)
> 3499.4000000000001
> 
> My Python 2.5.1 spat that out..

No, round() return binary floats that, in general, cannot represent 
decimal floats exactly.  Formatted printing gives what you expect.
 >>> '%8.2f' % x
' 3499.35'