[issue27100] Attempting to use class with both __enter__ & __exit__ undefined yields __exit__ attribute error

[Spencer Brown]

Spencer Brown added the comment:

Alternatively, SETUP_WITH could additionally check for the other method, and raise an AttributeError with a custom message mentioning both methods.

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nosy: +Spencer Brown

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27100>
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