Barry A. Warsaw added the comment:

That's a backward compatibility break since existing code may be expecting 
None.  At least it needs to be carefully considered, and should have no 
possibility of be applied to anything before Python 3.5.

----------
nosy: +barry
versions:  -Python 2.7, Python 3.2, Python 3.3, Python 3.4, Python 3.6

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<http://bugs.python.org/issue23189>
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