[issue32933] mock_open does not support iteration around text files.

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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nosy: +ezio.melotti, michael.foord, rbcollins
versions: +Python 3.8 -Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32933>
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