'isa' keyword

[Rocco Moretti]

Terry Hancock wrote:
> On Thursday 01 September 2005 07:28 am, Fuzzyman wrote:
> 
>>What's the difference between this and ``isinstance`` ?
> 
> I must confess that an "isa" operator sounds like it would
> have been slightly nicer syntax than the isinstance() built-in
> function. But not enough nicer to change, IMHO.

Especially conidering that checking parameters with "isinstance" is 
considered bad form with Python's duck typing.