The Inet type knows how to adapt itself.

Implemented __conform__ as the Adaptation PEP suggests. It is not
required for the type to be registered as adapter.

lib/extras.py

@@ -423,6 +423,10 @@ class Inet(object):
             obj.prepare(self._conn)
         return obj.getquoted()+"::inet"
 
+    def __conform__(self, foo):
+        if foo is _ext.ISQLQuote:
+            return self
+
     def __str__(self):
         return str(self.addr)
         
@@ -432,7 +436,6 @@ def register_inet(oid=None, conn_or_curs=None):
     _ext.INET = _ext.new_type((oid, ), "INET",
             lambda data, cursor: data and Inet(data) or None)
     _ext.register_type(_ext.INET, conn_or_curs)
-    _ext.register_adapter(Inet, lambda x: x)
     return _ext.INET
 
 

tests/types_extras.py

@@ -79,6 +79,19 @@ class TypesExtrasTests(unittest.TestCase):
         s = self.execute("SELECT NULL::inet AS foo")
         self.failUnless(s is None)
 
+    def test_inet_conform(self):
+        from psycopg2.extras import Inet
+        i = Inet("192.168.1.0/24")
+        a = psycopg2.extensions.adapt(i)
+        a.prepare(self.conn)
+        self.assertEqual("E'192.168.1.0/24'::inet", a.getquoted())
+
+        # adapts ok with unicode too
+        i = Inet(u"192.168.1.0/24")
+        a = psycopg2.extensions.adapt(i)
+        a.prepare(self.conn)
+        self.assertEqual("E'192.168.1.0/24'::inet", a.getquoted())
+
     def test_adapt_fail(self):
         class Foo(object): pass
         self.assertRaises(psycopg2.ProgrammingError,