Guido van Rossum <gu...@python.org> added the comment:

This was discussed during the PEP review and rejected. The main reason is that 
this operator would need to create a new instance, and there is no standard API 
that's part of the Mapping protocol that can be used (the constructor of a 
Mapping instance might have unknown parameters).

----------
nosy: +gvanrossum
resolution:  -> wont fix
stage: patch review -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42841>
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