[issue25690] Replacement for unittest.mock.mock_open

[SilentGhost]

Changes by SilentGhost <ghost.adh at gmail.com>:


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components: +Tests
nosy: +ezio.melotti, michael.foord, rbcollins
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25690>
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