[issue31177] unittest mock's reset_mock throws an error when an attribute has been deleted

[Eli_B]

Eli_B <eli.boyarski at gmail.com> added the comment:

I suggest that after reset_mock(), deleted attributes should be available again. In other words, their deletion is reset.

I'm opening a PR to this effect.

I reported this issue to testing-cabal's mock repo in May 2016 (https://github.com/testing-cabal/mock/pull/361), but my original PR there just avoided an exception without reinstating the deleted attribute.

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nosy: +Eli_B

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<https://bugs.python.org/issue31177>
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