[issue17400] ipaddress should make it easy to identify rfc6598 addresses

[Nick Coghlan]

Nick Coghlan added the comment:

The docs patch doesn't look quite right - Peter, did you mean to copy the "is_private" docs before modifying them?

As far as caching goes, perhaps we can just drop functools.lru_cache into the relevant property implementations?

    @property
    @lru_cache()
    def is_global(self):
        """Test if this address is allocated for public networks."""

(also in copying that example method header, I noticed the docstring for the IPv4 is_global currently still says "private" instead of "public")

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<http://bugs.python.org/issue17400>
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