[issue43901] Lazy-create an empty annotations dict in all unannotated user classes and modules

[Jelle Zijlstra]

Jelle Zijlstra <jelle.zijlstra at gmail.com> added the comment:

For what it's worth, I checked grep.app and found only one usage of del on __annotations__, in a test suite: https://github.com/go-python/gpython/blob/master/py/tests/function.py#L82. Changing its behavior seems very low risk.

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nosy: +Jelle Zijlstra

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<https://bugs.python.org/issue43901>
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