On Wed, Oct 14, 2015 at 3:08 AM, Random832 <[email protected]> wrote:
> If you are writing code that tries
> to resume iterating after the iterator has been exhausted, I have to
> ask: why?
A well-behaved iterator is supposed to continue raising StopIteration
forever once it's been exhausted. I don't know how much code actually
depends on this, but it wouldn't be hard to make a wrapper that raises
a different exception instead:
class iter:
_orig_iter = iter
def __init__(self, thing):
self.iter = self._orig_iter(thing)
self.exhausted = False
def __iter__(self): return self
def __next__(self):
if self.exhausted: raise RuntimeError("Already exhausted")
try: return next(self.iter)
except StopIteration:
self.exhausted = True
raise
Play with that, and see where RuntimeErrors start coming up. I suspect
they'll be rare, but they will happen.
ChrisA
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