Seth Bromberger added the comment:
1) However:
>>> b = ipaddress.IPv4Address('1.2.3.4')
>>> a = ipaddress.IPv4Address('1.2.3.4')
>>> id(a)
4428380928
>>> id(b)
4428381768
>>> a == b
True
>>> b._ip += 6
>>> id(b)
4428381768
>>> b
IPv4Address('1.2.3.10')
2) Isn’t _version already a class attribute? It’s set in _Basev4/Basev6.
3) Memory consumption seems particularly wasteful in the current
implementation: it takes 56 bytes (via sys.getsizeof) to store what amounts to
4 bytes of data.
I thought about subclassing Int as well, and I agree it’s the wrong approach.
There are too many int methods that don’t make sense in the context of IP
addresses.
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<http://bugs.python.org/issue23103>
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