10000 Make the iter_except() recipe more compact. by rhettinger · Pull Request #116132 · python/cpython · GitHub
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Make the iter_except() recipe more compact. #116132

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Feb 29, 2024
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Make the iter_except() recipe more compact. #116132

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21 changes: 1 addition & 20 deletions Doc/library/itertools.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -983,36 +983,17 @@ which incur interpreter overhead.
""" Call a function repeatedly until an exception is raised.

Converts a call-until-exception interface to an iterator interface.
Like builtins.iter(func, sentinel) but uses an exception instead
of a sentinel to end the loop.

Priority queue iterator:
iter_except(functools.partial(heappop, h), IndexError)

Non-blocking dictionary iterator:
iter_except(d.popitem, KeyError)

Non-blocking deque iterator:
iter_except(d.popleft, IndexError)

Non-blocking iterator over a producer Queue:
iter_except(q.get_nowait, Queue.Empty)

Non-blocking set iterator:
iter_except(s.pop, KeyError)

"""
# iter_except(d.popitem, KeyError) --> non-blocking dictionary iterator
try:
if first is not None:
# For database APIs needing an initial call to db.first()
yield first()
while True:
yield func()
except exception:
pass



The following recipes have a more mathematical flavor:

.. testcode::
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