[Python-ideas] Give ipaddresses an __index__ method
steve at pearwood.info
Wed Feb 14 19:18:23 EST 2018
This idea is inspired by Eric Osborne's post "Extending __format__
method in ipaddress", but I wanted to avoid derailing that thread.
I notice what seems to be an inconsistency in the ipaddress objects:
py> v4 = ipaddress.IPv4Address('18.104.22.168')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'IPv4Address' object cannot be interpreted as an integer
But that's surely not right: we just need to explicitly do so:
IP addresses are, in a strong sense, integers: either 32 or 128 bits.
And they can be explicitly converted losslessly to and from integers:
py> v4 == ipaddress.IPv4Address(int(v4))
Is there a good reason not to give them an __index__ method so that
bin(), oct() and hex() will work directly?
py> class X(ipaddress.IPv4Address):
... def __index__(self):
... return int(self)
py> a = X('22.214.171.124')
I acknowledge one potentially undesirable side-effect: this would
allow using IP addresses as indexes into sequences:
but while it's weird to do this, I don't think it's logically wrong.
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