[issue20074] open() of read-write non-seekable streams broken

[Roundup Robot]

Roundup Robot added the comment:

New changeset 100f632d4306 by R David Murray in branch '3.3':
#18116: backport fix to 3.3 since real-world failure mode demonstrated.
http://hg.python.org/cpython/rev/100f632d4306

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nosy: +python-dev

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