Steven D'Aprano wrote:
> Consider the following common exception handling idiom:
>
> def func(iterable):
> it = iter(iterable)
> try:
> x = next(it)
> except StopIteration:
> raise ValueError("can't process empty iterable")
> print(x)
>
> The intention is:
>
> * detect an empty iterator by catching StopIteration;
> * if the iterator is empty, raise a ValueError;
> * otherwise process the iterator.
>
> Note that StopIteration is an internal detail of no relevance whatsoever
> to the caller. Expose this is unnecessary at best and confusing at worst.
http://mail.python.org/pipermail/python-list/2010-October/1258606.html
http://mail.python.org/pipermail/python-list/2010-October/1259024.html
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