> From: David Abrahams [mailto:david.abrahams@rcn.com]
>
> One other possibility: if x.__iter__() is x, it's a
> single-pass sequence. I
> realize this involves actually invoking the __iter__ method
> and conjuring
> up a new iterator, but that's generally a lightweight operation...
Definitely not reliable - it will fail for a file object ... (even with the
changes currently going in).
What would be more reliable (but still not infallible) would be:
if iter(x) == iter(x):
# this is *definitely* a single-pass iterable
All iterators are by definition single-pass iterables, and with the changes
being made to the file object, the above code would work for all builtin
iterable types as well.
Tim Delaney
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