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

[Yurii Karabas]

Yurii Karabas <1998uriyyo at gmail.com> added the comment:

I have implemented this feature using an idea provided by Xiang Zhang.
Basically, property has new optional attribute `name` which will be added to msg of `AttributeError` in a case when `name` is set.

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