[issue39551] mock patch should match behavior of import from when module isn't present in sys.modules

[Dino Viehland]

Dino Viehland <dinoviehland at gmail.com> added the comment:

It's related to bpo-39336.  If you have an immutable package which doesn't allow it's children to be published on it when following the chain of packages it ends up not arriving at the final module.

But you can also hit it if you end up doing the patch during a relative import, although that seems much less likely.  But it generally seems matching the behavior of imports would be good to me.

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stage: patch review -> needs patch

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39551>
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