On Tue, Aug 28, 2012 at 6:00 AM, Peter Otten <[email protected]> wrote:
>
> Anyway here's an alternative implementation:
>
>>>> def vi(x):
> ... if not isinstance(x, numbers.Number):
> ... raise TypeError
> ... if not int(x) == x:
> ... raise ValueError
You could test against numbers.Integral. But it's not fool-proof.
Someone can register an incompatible class with the abstract base
class (ABC).
>>> import numbers
>>> isinstance("42", numbers.Integral)
False
>>> numbers.Integral.register(str)
>>> isinstance("42", numbers.Integral)
True
http://docs.python.org/library/abc
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