Terry J. Reedy added the comment:

/non-local/Non-local/ If we add the hyphen, perhaps we should add 'non-global' 
also.

Thanks for the concrete draft. It is definitely an improvement.

The last sentence is somewhat redundant with the second. The problem with the 
last sentence is that it only said that changes to the dict might not propagate 
back the the namespace, while is is also true that changes to the namespace 
might or might not propagate to the dict. The new second sentence says both. In 
addition, I somewhat disagree with 'should not modify'. A person could have a 
perfectly good reason to do so, but they should not expect propagation of the 
changes. So I am tempted to drop the last sentence. On the other hand, 
'undefined' should be somewhere.

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<http://bugs.python.org/issue17546>
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