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Sorry for the misclassification, and thanks for correcting that.
I agree, this issue is most likely related to issue 10647; but at some level I think they must be different, because issue 10647 seems to be specific to Python 3.1 under Windows; I could not reproduce that issue neither under Ubuntu nor with Python 3.2 in Windows. This behaviour on the other hand I could reproduce with Python 2.7 and Python 3.2 in both Ubuntu and Windows. The underlying problem in both cases, I believe, is similar: That int/float arguments are somewhere turned into locale-dependent string representations and later parsed back using a potentially different locale.
Which brings me to why I consider this to be a bug - sorry for not having made that point clearer: The handling of the float argument depends on the system locale. If you change the example script to run with an English locale, you do not get an error; instead, the float is implicitly used as an int, and everything is fine. Only if you use German or a similar locale, will the float trigger an error. So the behaviour is at the very least inconsistent. If treating a float argument as an error is deemed acceptable, then this error should not be locale-dependent.