I would prefer plain 'yield' to 'yield break' as a synonym for 'raise
StopIteration'.
But the raise stands out better visually as an exit point.
The point about the raise not being explicitly caught is not valid since
any generator could be used in the following code
g = some_gen
try:
while True:
process(g.next())
except StopIteration:
whatever()
where it is caught. Then under your proposal, there would be a catch
without a throw ;-(.
If there were a use case for empty generators, then iter() could be made to
produce one, in analogy with int() returning 0, etc. But without a use
case, 'iter()' is much more likely to be a bug and should be flagged as
such. In the meanwhile, 'iter(())' is trivial to type.
Terry Jan Reedy
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