https://github.com/python/cpython/commit/bd73e72b4a9f019be514954b1d40e64dc3a5e81c
> commit: bd73e72b4a9f019be514954b1d40e64dc3a5e81c
> branch: master
> author: Allen W. Smith, Ph.D <drallensm...@users.noreply.github.com>
> committer: Antoine Pitrou <pit...@free.fr>
> date: 2017-08-30T00:52:18+02:00
> summary:
>
> ...
> @@ -307,6 +309,10 @@ def imap(self, func, iterable, chunksize=1):
> ))
> return result
> else:
> + if chunksize < 1:
> + raise ValueError(
> + "Chunksize must be 1+, not {0:n}".format(
> + chunksize))
> assert chunksize > 1
It looks like removing this assert statement was missed.
--Chris
> task_batches = Pool._get_tasks(func, iterable, chunksize)
> result = IMapIterator(self._cache)
> @@ -334,7 +340,9 @@ def imap_unordered(self, func, iterable, chunksize=1):
> ))
> return result
> else:
> - assert chunksize > 1
> + if chunksize < 1:
> + raise ValueError(
> + "Chunksize must be 1+, not {0!r}".format(chunksize))
> task_batches = Pool._get_tasks(func, iterable, chunksize)
> result = IMapUnorderedIterator(self._cache)
> self._taskqueue.put(
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