subscripting Python 3 dicts/getting the only value in a Python 3 dict

[Ian Kelly]

On Tue, Jan 12, 2016 at 10:12 AM, Terry Reedy <tjreedy at udel.edu> wrote:
> Using the values views at intended (as an iterable):
>
>>>> dv = d.values()
>>>> next(iter(dv))
> 1

Good coding practice also dictates that whenever next is called, the
potential StopIteration exception must be caught unless it is clearly
intended to be propagated up to some generator. So more fully, this
should be something like:

dv = iter(d.values())
try:
    next(dv)
except StopIteration:
    raise IndexError("d is empty")

At which point it may be desirable to extract that into a utility function.