R. David Murray added the comment:

I haven't read the thread that Ned points to, but I do note that replacing the 
value is exactly how Python dict literals work.

Also, even if we decide that we want an error, I don't think it is a change 
that could be backported, since it could easily make currently working code 
stop working.

(This is may be a case where "status quo wins a stalemate".)

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nosy: +r.david.murray

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