Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Unconditional replacing an exception is bad, because it can hide important 
exceptions like KeybordInterrupt or MemoryError.

What if raise a new exception only if TypeError was raised? This will cover the 
case of a __set_name__() method with wrong signature.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33576>
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