[issue20480] Add ipaddress property to get name of reverse DNS PTR record

[Leon Weber]

Leon Weber added the comment:

I noticed an inconsistency between IPv4 and IPv6 in my temporary variable names when looking at the patch again after a few days. Here’s an updated patch. Not that it’s important, but I sleep better that way :)

As consensus seems to have settled on leaving out the trailing dot, I only updated the version without the dot.

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Added file: http://bugs.python.org/file33940/ipaddress_reverse_names_v4.patch

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