STINNER Victor added the comment:

Linux manual page: "If  AI_NUMERICSERV  is  specified  in hints.ai_flags and 
service is not NULL, then service must point to a string containing a numeric 
port number."

So it looks like None is accepted on Linux. I checked: the example doesn't 
crash.

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nosy: +haypo

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<http://bugs.python.org/issue17269>
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