[FIX] P3: __nonzero__ -> __bool__

Also ~removed bool-testing on cursors

odoo/models.py

@@ -169,8 +169,9 @@ class MetaModel(api.Meta):
 
 class NewId(object):
     """ Pseudo-ids for new records. """
-    def __nonzero__(self):
+    def __bool__(self):
         return False
+    __nonzero__ = __bool__
 
 IdType = pycompat.integer_types + (str, unicode, NewId)
 
@@ -4501,9 +4502,10 @@ class BaseModel(MetaModel('DummyModel', (object,), {'_register': False})):
     # "Dunder" methods
     #
 
-    def __nonzero__(self):
+    def __bool__(self):
         """ Test whether ``self`` is nonempty. """
         return bool(getattr(self, '_ids', True))
+    __nonzero__ = __bool__
 
     def __len__(self):
         """ Return the size of ``self``. """

odoo/sql_db.py

@@ -642,15 +642,9 @@ class Connection(object):
     # serialized_cursor is deprecated - cursors are serialized by default
     serialized_cursor = cursor
 
-    def __nonzero__(self):
-        """Check if connection is possible"""
-        try:
-            _logger.info("__nonzero__() is deprecated. (It is too expensive to test a connection.)")
-            cr = self.cursor()
-            cr.close()
-            return True
-        except Exception:
-            return False
+    def __bool__(self):
+        raise NotImplementedError()
+    __nonzero__ = __bool__
 
 def connection_info_for(db_or_uri):
     """ parse the given `db_or_uri` and return a 2-tuple (dbname, connection_params)