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Raise a RuntimeError when tee iterator is consumed from different threads (GH-15567)

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HongWeipeng 2019-08-29 11:39:25 +08:00 • committed by Raymond Hettinger
parent 13f37f2ba8
commit fa220ec763
3 changed files with 12 additions and 1 deletions
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Doc/library/itertools.rst
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@ -643,7 +643,8 @@ loops that truncate the stream.
Once :func:`tee` has made a split, the original *iterable* should not be
used anywhere else; otherwise, the *iterable* could get advanced without
the tee objects being informed.
the tee objects being informed. the :func:`tee` iterator can not be consumed
from different threads, even if an underlying iterator is thread-safe.
This itertool may require significant auxiliary storage (depending on how
much temporary data needs to be stored). In general, if one iterator uses