Re: does lack of type declarations make Python unsafe?
 

david.abrahams@rcn.com (David Abrahams) wrote in message news:<ea97dfd9.0306290730.137c6837@posting.google. com>...

> Alex Martelli <aleax@aleax.it> writes:
>
> > In Python one generally identifies (just as informally) a container as
> > "an object which has a length" (using "length", perhaps a suboptimal
> > choice of wording, to mean "number of items currently contained") and
> > simultaneously express both 'c is a container' and
> > 'that container is not empty' by
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sorry, I missed that.

> >
> > assert len(c)
>
> That understanding of "containerness" is, AFAICT, not universally held
> among Pythonistas by any means.

I still stand by the above.

> Good thing too, probably: it looks
> like there is no such thing as an empty container:
>
> >>> assert len([])
> Traceback ...

But that example was obviously just wrong.

-Ddave