[Python-Dev] Re: A proposal has surfaced on comp.lang.pythontoredefine"is"

[Andrew Koenig]

> Until someone writes, tests, and publishes an equiv function, and others
> verify its usefulness, that strikes me as a speculative hypothesis.
> Concrete code would also be clearer to me than the natural language
> definitions I have seen.

I would do so if I knew an easy way to determine whether an object is
mutable.