Josh Rosenberg added the comment:
+1; I've had several cases where I'd have used something like this (for the
exact purpose mentioned, to destructively consume an input iterable). I don't
think it's more or less useful than the sentinel version, which is convenient
for iterating a file by blocks instead of by line, e.g.:
from functools import partial
with open('...', 'rb') as f:
for block in iter(partial(f.read, 4096), b''):
...
But it would still nice to be able to destructively iterate sequences,
particularly in CPython, where doing it at the C level can get you atomicity
without relying on anything beyond the GIL (and without wrapping infinite while
loops in try/except: pass blocks, which is pointlessly verbose).
One issue: You can't just make the second argument allow exception types as
well, since it's possible (however unlikely) for an exception type to be a
legitimate return type from a function. Making it keyword only would solve that
problem though.
----------
nosy: +josh.rosenberg
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<http://bugs.python.org/issue20663>
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