165     def __exit__(self, exctype, exc, traceback):

   165     def __exit__(self, exctype, exc, traceback):

   166         if self.oldread is not None:

   166         if self.oldread is not None:

   167             self.cnx.read_security = self.oldread

   167             self.cnx.read_security = self.oldread

   168         if self.oldwrite is not None:

   168         if self.oldwrite is not None:

   169             self.cnx.write_security = self.oldwrite

   169             self.cnx.write_security = self.oldwrite

   170 

   171 

   171 HOOKS_ALLOW_ALL = object()

   172 HOOKS_ALLOW_ALL = object()

   172 HOOKS_DENY_ALL = object()

   173 HOOKS_DENY_ALL = object()

   173 DEFAULT_SECURITY = object()  # evaluated to true by design

   174 DEFAULT_SECURITY = object()  # evaluated to true by design

   174 

   175