Dynamically replacing an objects __class__; is it safe?

[MRAB]

On 2017-03-15 22:03, Gregory Ewing wrote:
> Steve D'Aprano wrote:
>> You probably can't make a whale fly just by changing the class to bird. It
>> will need wings, and feathers, at the very least.
>
> Some things succeed in flying with neither wings nor feathers.
> Helicopters, for example.
>
Could you argue that the blades were a kind of wing? After all, they 
rely on the same principle of moving through the air to produce lift.

Balloons, on the other hand, ... :-)