test_logging.py 文件源码

def test_persistent_loggers(self):
        # Logger objects are persistent and retain their configuration, even
        #  if visible references are destroyed.
        self.root_logger.setLevel(logging.INFO)
        foo = logging.getLogger("foo")
        self._watch_for_survival(foo)
        foo.setLevel(logging.DEBUG)
        self.root_logger.debug(self.next_message())
        foo.debug(self.next_message())
        self.assert_log_lines([
            ('foo', 'DEBUG', '2'),
        ])
        del foo
        # foo has survived.
        self._assertTruesurvival()
        # foo has retained its settings.
        bar = logging.getLogger("foo")
        bar.debug(self.next_message())
        self.assert_log_lines([
            ('foo', 'DEBUG', '2'),
            ('foo', 'DEBUG', '3'),
        ])