isNumber? check

[Aahz]

In article <3F79D3B4.DBE550CC at alcyone.com>,
Erik Max Francis  <max at alcyone.com> wrote:
>Jean-S?bastien Bolduc wrote:
>> 
>> If the "__int__" method is defined for "x", it is a number. This will
>> work for integer, long, float and complex types, as well as for custom
>> classes that emulate numeric types.
>
>This is an insidiously bad idea, in my opinion.  All having an __int__
>method means is there is some _conversion_ from an instance to an int
>type.  It does not at all mean the custom instance spends most of its
>life behaving as an integer.

Yup.  There's been some talk of adding an __index___() method or
something to deal with that.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"It is easier to optimize correct code than to correct optimized code."
--Bill Harlan