Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> writes:
> def func(iterable):
> it = iter(iterable)
> failed = False
> try:
> x = next(it)
> except StopIteration:
> failed = True
> if failed:
> raise ValueError("can't process empty iterable")
> print(x)
Untested:
from itertools import islice
def func(iterable):
xs = list(islice(iter(iterable), 1))
if len(xs) == 0:
raise ValueError(...)
print xs[0]
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