gh-115766: Fix IPv4Interface.is_unspecified (GH-137326)

Author: aisk

Lib/ipaddress.py

@@ -1479,6 +1479,10 @@ def with_hostmask(self):
         return '%s/%s' % (self._string_from_ip_int(self._ip),
                           self.hostmask)
 
+    @property
+    def is_unspecified(self):
+        return self._ip == 0 and self.network.is_unspecified
+
 
 class IPv4Network(_BaseV4, _BaseNetwork):
 

Lib/test/test_ipaddress.py

@@ -2269,6 +2269,10 @@ def testReservedIpv4(self):
         self.assertEqual(False, ipaddress.ip_network('240.0.0.0').is_multicast)
         self.assertEqual(True, ipaddress.ip_network('240.0.0.0').is_reserved)
 
+        self.assertTrue(ipaddress.ip_interface('0.0.0.0/32').is_unspecified)
+        self.assertFalse(ipaddress.ip_interface('0.0.0.0/31').is_unspecified)
+        self.assertFalse(ipaddress.ip_interface('1.2.3.4/32').is_unspecified)
+
         self.assertEqual(True, ipaddress.ip_interface(
                 '192.168.1.1/17').is_private)
         self.assertEqual(False, ipaddress.ip_network('192.169.0.0').is_private)

Misc/NEWS.d/next/Library/2025-08-03-00-36-57.gh-issue-115766.nJCFkW.rst

@@ -0,0 +1 @@
+Fix :attr:`!ipaddress.IPv4Interface.is_unspecified`.