[issue27794] setattr a read-only property; the AttributeError should show the attribute that failed

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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components: +Interpreter Core
nosy: +ncoghlan
stage:  -> needs patch
versions: +Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27794>
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