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

[Xiang Zhang]

Xiang Zhang added the comment:

This seems to be designed. From PEP343 it tells clearly:

    If either of the relevant methods are not found
    as expected, the interpreter will raise AttributeError, in the
    order that they are tried (__exit__, __enter__).

But currently I don't find out why.

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nosy: +xiang.zhang

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<http://bugs.python.org/issue27100>
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