notify.py 文件源码

def notify(self, *args, **kwargs):
        """
        Call all listener callbacks. The wrapped function is not executed.
        """
        for listener in self.nm_listeners:
            # Ensure that all callbacks get called, and no exceptions escape to
            # the caller.
            try:
                listener(*args, **kwargs)
            except:
                # If the target is a notify_callback--which should always be
                # the case as long as the proper API is used--show the actual
                # function
                target = getattr(listener, 'nc_func', listener)
                print >>sys.stderr, 'Exception in notification %s:' % (repr(target),)
                traceback.print_exception(*sys.exc_info())