我们从Python开源项目中，提取了以下6个代码示例，用于说明如何使用logging.lastResort()。
def callHandlers(self, record): # this is the same as Python 3.5's logging.Logger.callHandlers c = self found = 0 while c: for hdlr in c.handlers: found = found + 1 if record.levelno >= hdlr.level: hdlr.handle(record) if not c.propagate: c = None # break out else: c = c.parent if (found == 0): if logging.lastResort: if record.levelno >= logging.lastResort.level: logging.lastResort.handle(record) elif logging.raiseExceptions and not self.manager.emittedNoHandlerWarning: sys.stderr.write("No handlers could be found for logger" " \"%s\"\n" % self.name) self.manager.emittedNoHandlerWarning = True
def configure_standard_logging(verbosity: int, mode: LoggingMode): """Configure the standard library's `logging` module. Get `logging` working with options consistent with Twisted. NOTE CAREFULLY that `django.utils.log.DEFAULT_LOGGING` may have been applied (though only if installed and if configured in this environment). Those settings and the settings this function applies must be mentally combined to understand the resultant behaviour. :param verbosity: See `get_logging_level`. :param mode: The mode in which to configure logging. See `LoggingMode`. """ set_standard_verbosity(verbosity) # Make sure that `logging` is not configured to capture warnings. logging.captureWarnings(False) # If a logger is ever configured `propagate=False` but without handlers # `logging.Logger.callHandlers` will employ the `lastResort` handler in # order that the log is not lost. This goes to standard error by default. # Here we arrange for these situations to be logged more distinctively so # that they're easier to diagnose. logging.lastResort = ( logging.StreamHandler( twistedModern.LoggingFile( logger=twistedModern.Logger("lost+found"), level=twistedModern.LogLevel.error)))
def test_last_resort(self): # Test the last resort handler root = self.root_logger root.removeHandler(self.root_hdlr) old_stderr = sys.stderr old_lastresort = logging.lastResort old_raise_exceptions = logging.raiseExceptions try: sys.stderr = sio = io.StringIO() root.warning('This is your final chance!') self.assertEqual(sio.getvalue(), 'This is your final chance!\n') #No handlers and no last resort, so 'No handlers' message logging.lastResort = None sys.stderr = sio = io.StringIO() root.warning('This is your final chance!') self.assertEqual(sio.getvalue(), 'No handlers could be found for logger "root"\n') # 'No handlers' message only printed once sys.stderr = sio = io.StringIO() root.warning('This is your final chance!') self.assertEqual(sio.getvalue(), '') root.manager.emittedNoHandlerWarning = False #If raiseExceptions is False, no message is printed logging.raiseExceptions = False sys.stderr = sio = io.StringIO() root.warning('This is your final chance!') self.assertEqual(sio.getvalue(), '') finally: sys.stderr = old_stderr root.addHandler(self.root_hdlr) logging.lastResort = old_lastresort logging.raiseExceptions = old_raise_exceptions
def test_last_resort(self): # Test the last resort handler root = self.root_logger root.removeHandler(self.root_hdlr) old_stderr = sys.stderr old_lastresort = logging.lastResort old_raise_exceptions = logging.raiseExceptions try: sys.stderr = sio = io.StringIO() root.debug('This should not appear') self.assertEqual(sio.getvalue(), '') root.warning('This is your final chance!') self.assertEqual(sio.getvalue(), 'This is your final chance!\n') #No handlers and no last resort, so 'No handlers' message logging.lastResort = None sys.stderr = sio = io.StringIO() root.warning('This is your final chance!') self.assertEqual(sio.getvalue(), 'No handlers could be found for logger "root"\n') # 'No handlers' message only printed once sys.stderr = sio = io.StringIO() root.warning('This is your final chance!') self.assertEqual(sio.getvalue(), '') root.manager.emittedNoHandlerWarning = False #If raiseExceptions is False, no message is printed logging.raiseExceptions = False sys.stderr = sio = io.StringIO() root.warning('This is your final chance!') self.assertEqual(sio.getvalue(), '') finally: sys.stderr = old_stderr root.addHandler(self.root_hdlr) logging.lastResort = old_lastresort logging.raiseExceptions = old_raise_exceptions
