Python logging 模块，PlaceHolder() 实例源码

我们从Python开源项目中，提取了以下4个代码示例，用于说明如何使用logging.PlaceHolder()。

项目：microcosm-flask 作者：globality-corp | 项目源码 | 文件源码

def make_logger_node(name, logger, parent=None):
    if isinstance(logger, PlaceHolder):
        # some loggers are instances of logging.PlaceHolder
        level = parent.level
    else:
        level = humanize_level(logger.getEffectiveLevel())

    node = Logger(name, level, logger, [])
    if parent is not None:
        parent.children.append(node)
    return node

项目：PyDevNS 作者：daveisadork | 项目源码 | 文件源码

def log_level(self, level):
        logger.debug("Setting config.log_level to %r", level)
        logging.getLogger().setLevel(level)
        logging._acquireLock()
        for name, _logger in iteritems(logging.Logger.manager.loggerDict):
            if isinstance(_logger, logging.PlaceHolder):
                continue
            _logger.setLevel(level)
        logging._releaseLock()

项目：pyethereum 作者：ethereumproject | 项目源码 | 文件源码

def configure(config_string=None, log_json=False, log_file=None):
    if not config_string:
        config_string = ":{}".format(DEFAULT_LOGLEVEL)

    if log_json:
        SLogger.manager.log_json = True
        log_format = JSON_FORMAT
    else:
        SLogger.manager.log_json = False
        log_format = PRINT_FORMAT

    if len(rootLogger.handlers) == 0:
        handler = StreamHandler()
        formatter = Formatter(log_format)
        handler.setFormatter(formatter)
        rootLogger.addHandler(handler)
    if log_file:
        if not any(isinstance(hndlr, FileHandler) for hndlr in rootLogger.handlers):
            handler = FileHandler(log_file)
            formatter = Formatter("{} {}".format(FILE_PREFIX, log_format))
            handler.setFormatter(formatter)
            rootLogger.addHandler(handler)

    # Reset logging levels before applying new config below
    for name, logger in SLogger.manager.loggerDict.items():
        if hasattr(logger, 'setLevel'):
            # Guard against `logging.PlaceHolder` instances
            logger.setLevel(logging.NOTSET)
            logger.propagate = True

    for name_levels in config_string.split(','):
        name, _, level = name_levels.partition(':')
        logger = getLogger(name)
        logger.setLevel(level.upper())

项目：blockhooks 作者：EthereumWebhooks | 项目源码 | 文件源码

def configure(config_string=None, log_json=False, log_file=None):
    if not config_string:
        config_string = ":{}".format(DEFAULT_LOGLEVEL)

    if log_json:
        SLogger.manager.log_json = True
        log_format = JSON_FORMAT
    else:
        SLogger.manager.log_json = False
        log_format = PRINT_FORMAT

    if len(rootLogger.handlers) == 0:
        handler = StreamHandler()
        formatter = Formatter(log_format)
        handler.setFormatter(formatter)
        rootLogger.addHandler(handler)
    if log_file:
        if not any(isinstance(hndlr, FileHandler) for hndlr in rootLogger.handlers):
            handler = FileHandler(log_file)
            formatter = Formatter("{} {}".format(FILE_PREFIX, log_format))
            handler.setFormatter(formatter)
            rootLogger.addHandler(handler)

    # Reset logging levels before applying new config below
    for name, logger in SLogger.manager.loggerDict.items():
        if hasattr(logger, 'setLevel'):
            # Guard against `logging.PlaceHolder` instances
            logger.setLevel(logging.NOTSET)
            logger.propagate = True

    for name_levels in config_string.split(','):
        name, _, level = name_levels.partition(':')
        logger = getLogger(name)
        logger.setLevel(level.upper())