commit 3326c9267f9df15fa77094b8a740be4eaa4b9374
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Tue Mar 20 18:22:23 2018 -0700
committer GitHub <noreply@github.com> Tue Mar 20 18:22:23 2018 -0700
tree b1ac4029bdeea884d3e8ae1c392ccaad19b1a1e9
parent a323eee4c481c88f2b4030bbb224d9bc6bc14c9c

bpo-27683: Fix a regression for host() of ipaddress network objects (GH-6016)


The result of host() was not empty when the network is constructed by a tuple containing an
integer mask and only 1 bit left for addresses.
(cherry picked from commit 10b134a07c898c2fbc5fd3582503680a54ed80a2)

Co-authored-by: Xiang Zhang <angwerzx@126.com>

Lib/test/test_ipaddress.py

diff --git a/Lib/test/test_ipaddress.py b/Lib/test/test_ipaddress.py
index a5aeb79..0e0753f 100644
--- a/Lib/test/test_ipaddress.py
+++ b/Lib/test/test_ipaddress.py
@@ -1127,10 +1127,30 @@
         self.assertEqual(ipaddress.IPv4Address('1.2.3.1'), hosts[0])
         self.assertEqual(ipaddress.IPv4Address('1.2.3.254'), hosts[-1])
 
+        ipv6_network = ipaddress.IPv6Network('2001:658:22a:cafe::/120')
+        hosts = list(ipv6_network.hosts())
+        self.assertEqual(255, len(hosts))
+        self.assertEqual(ipaddress.IPv6Address('2001:658:22a:cafe::1'), hosts[0])
+        self.assertEqual(ipaddress.IPv6Address('2001:658:22a:cafe::ff'), hosts[-1])
+
         # special case where only 1 bit is left for address
-        self.assertEqual([ipaddress.IPv4Address('2.0.0.0'),
-                          ipaddress.IPv4Address('2.0.0.1')],
-                         list(ipaddress.ip_network('2.0.0.0/31').hosts()))
+        addrs = [ipaddress.IPv4Address('2.0.0.0'),
+                 ipaddress.IPv4Address('2.0.0.1')]
+        str_args = '2.0.0.0/31'
+        tpl_args = ('2.0.0.0', 31)
+        self.assertEqual(addrs, list(ipaddress.ip_network(str_args).hosts()))
+        self.assertEqual(addrs, list(ipaddress.ip_network(tpl_args).hosts()))
+        self.assertEqual(list(ipaddress.ip_network(str_args).hosts()),
+                         list(ipaddress.ip_network(tpl_args).hosts()))
+
+        addrs = [ipaddress.IPv6Address('2001:658:22a:cafe::'),
+                 ipaddress.IPv6Address('2001:658:22a:cafe::1')]
+        str_args = '2001:658:22a:cafe::/127'
+        tpl_args = ('2001:658:22a:cafe::', 127)
+        self.assertEqual(addrs, list(ipaddress.ip_network(str_args).hosts()))
+        self.assertEqual(addrs, list(ipaddress.ip_network(tpl_args).hosts()))
+        self.assertEqual(list(ipaddress.ip_network(str_args).hosts()),
+                         list(ipaddress.ip_network(tpl_args).hosts()))
 
     def testFancySubnetting(self):
         self.assertEqual(sorted(self.ipv4_network.subnets(prefixlen_diff=3)),