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It's used in testcase already, and basic codes is from here:
https://github.com/openstack/manila/blob/master/manila_tempest_tests/utils.py#L93

Doug Hellmann <doug at doughellmann.com>于2016年10月17日周一 下午10:13写道：

> Excerpts from TommyLike Hu's message of 2016-10-17 09:56:15 +0000:
> > When I handle some stuff related to Manila recently, I found a case which
> > may be suitable for Oslo, Anyhow I put it in the maillist so it can be
> > discussed before I put it in action.
> > In testcase, we need a function(maybe 2) to generate random ip address
> (or
> > network), also they should in the range of [1](ipv4 documentation range)
> or
> > [2](ipv6 documentation range), this is the draft code for ipv4:
> >
> > import six
> > import random
> >
> >
> > def rand_ipv4(network=False):
> >     """This uses the TEST-NET-3 range of reserved IP addresses."""
> >
> >     test_net_3 = '203.0.113.'
> >     if network:
> >         host_length = random.randint(0, 8)
> >         address_segment = random.randint(0, 8 - host_length)
> >         address_segment <<= host_length
> >         address = test_net_3 + six.text_type(address_segment)
> >         address = '/'.join((address,
> >                             six.text_type(32 - host_length)))
> >     else:
> >         address = test_net_3 + six.text_type(random.randint(0, 255))
> >     return address
> >
> > The primary use case here is writing testcases,  I am not sure whether it
> > is suitable here, or maybe I misunderstood the intention of TEST-NET-3,
> > please leave any comment you like.
> >
> >
> > [1]  https://tools.ietf.org/html/rfc5737
> > [2]  https://tools.ietf.org/html/rfc5156
>
> In what way are you using random addresses in tests?
>
> Doug
>
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