Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> writes:
> I've never seen this second form in actual code. Does anyone use it,
> and if so, what use-cases do you have?
Since APIs that signal end-of-iteration by returning a sentinel have
fallen out of favor in Python (with good reason), this form is rare, but
still it's sometimes useful. I've used it in actual code for reading a
file in fixed-size chunks, like this:
for chunk in iter(lambda: f.read(CHUNK_SIZE), ''):
...
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