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Wed Aug 30 06:16:42 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-August/149079.html

https://github.com/python/cpython/commit/bd73e72b4a9f019be514954b1d40e64dc3a5e81c
> commit: bd73e72b4a9f019be514954b1d40e64dc3a5e81c
> branch: master
> author: Allen W. Smith, Ph.D <drallensmith at users.noreply.github.com>
> committer: Antoine Pitrou <pitrou at 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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Showing content from https://mail.python.org/pipermail/python-dev/2017-August/149079.html below:

[Python-Dev] [Python-checkins] bpo-5001: More-informative multiprocessing error messages (#3079)