check if object is number

[Fredrik Lundh]

Michael Hartl wrote

> As luck would have it, isnumber is a built-in Python function:
>
>>>> isnumber(1)
> True
>>>> isnumber(1.0)
> True
>>>> isnumber('1')
> False

and what strange Python version would that be?

>>> isnumber(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'isnumber' is not defined

</F>