does lack of type declarations make Python unsafe?

[Zac Jensen]

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On Sunday 15 June 2003 03:55 pm, martin z wrote:
> > You *can* test the types of the arguments yourself, inside
> > the function. But this is regarded bad practice amongst Python
> > programmers, for the above mentioned reasons.
>
> On this subject, is there a way to test not the specific type, or simply
> the protocol an object supports?  String, int, etc.  I want to make a
> function do one thing with a numeric-type object and a different thing with
> a string-type object.

Hm, perhaps hasattr() for the special __whatever__ attributes?

or if you know it has to be a set of types, you could do 
isinstance(whatevervar, (type1, type2, type3)) etc....

- -Zac
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