How to coerce a list of vars into a new type?

[Robert Kern]

bearophileHUGS at lycos.com wrote:
> Me:
>>> def f(a, b, c):
>>>     map(int, [a, b, c])
>>>     ...code...
> 
> Robert Kern:
>> That won't do anything since the names a, b, and c are never rebound.
> 
> I think you are wrong. Try to give a "35.0" or a "hello" to that
> function f, and see the results.
> 
> What it does is to: "verify that three parameters can all be converted
> into integers, but it doesn't modify the parameters themselves" as the
> OP asked.

Point.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco