python 通过logging写入日志到文件和控制台的实例

2020-02-22 23:54:41

字体：大中小

来源：转载

供稿：网友

如下所示：

import logging  # 创建一个logger logger = logging.getLogger('mylogger') logger.setLevel(logging.DEBUG)  # 创建一个handler，用于写入日志文件 fh = logging.FileHandler('test.log') fh.setLevel(logging.DEBUG)  # 再创建一个handler，用于输出到控制台 ch = logging.StreamHandler() ch.setLevel(logging.DEBUG)  # 定义handler的输出格式 formatter = logging.Formatter('[%(asctime)s][%(thread)d][%(filename)s][line: %(lineno)d][%(levelname)s] ## %(message)s')fh.setFormatter(formatter) ch.setFormatter(formatter)  # 给logger添加handler logger.addHandler(fh) logger.addHandler(ch)  # 记录一条日志 logger.info('foorbar')

关于formatter的配置，采用的是%(<dict key>)s的形式，就是字典的关键字替换。提供的关键字包括：

Format Description

%(name)s Name of the logger (logging channel).

%(levelno)s Numeric logging level for the message (DEBUG, INFO, WARNING, ERROR, CRITICAL).

%(levelname)s Text logging level for the message ('DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL').

%(pathname)s Full pathname of the source file where the logging call was issued (if available).

%(filename)s Filename portion of pathname.

%(module)s Module (name portion of filename).

%(funcName)s Name of function containing the logging call.

%(lineno)d Source line number where the logging call was issued (if available).

%(created)f Time when the LogRecord was created (as returned by time.time()).

%(relativeCreated)d Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded.