标签:out ima str img line 多个 basic logging handle
日志的主要作用是程序调试、数据分析。 日志有五个级别,代表问题的严重程度
python有个日志相关的logging模块,用法:
import logging logging.warning(‘Watch out!‘) # 输出到屏幕 logging.info(‘I told you so‘) # 不打印
因为logging模块默认的日志级别是warning,所以info级别的日志不会输出到屏幕。也就是说输出的日志级别要高于设置的日志级别才会输出日志
import logging logging.basicConfig(filename=‘example.log‘,level=logging.DEBUG) logging.debug(‘This message should go to the log file‘) logging.info(‘So should this‘) logging.warning(‘And this, too‘
将在‘example.log‘ 日志文件中看到
DEBUG:root:This message should be go to the log file INFO:root:So should this WARNING:root:And this, too
import logging logging.warning(‘%s before you %s‘, ‘Look‘, ‘leap!‘)
会显示
WARNING:root:Look before you leap!
定义时间
import logging logging.basicConfig(format=‘%(asctime)s %(message)s‘) logging.warning(‘is when this event was logged.‘)
会显示
2010-12-12 11:41:42,612 is when this event was logged.
更多日志格式参考
可以同时输出到文件和屏幕、或输出到多个文件,并且可以设置不同的级别,总之可以弄的很复杂。
一个同时输出日志到文件和控制台的例子
logger = logging.getLogger(__name__) # 获取logger对象 logger.setLevel(logging.DEBUG) # 设置全局的日志级别 # 创建基于控制台handler console = logging.StreamHandler() console.setLevel(logging.INFO) # 设置控制台的日志级别 # 创建基于文件handler fh = logging.FileHandler(log) fh.setLevel(logging.WARNING) # 设置日志文件级别 # 定义格式 formatter = logging.Formatter( ‘%(asctime)s - %(levelname)s - %(lineno)d - %(filename)s - %(message)s‘)
# 应用格式 console.setFormatter(formatter) fh.setFormatter(formatter) # 添加到logger logger.addHandler(console) logger.addHandler(fh)
这样日志文件和控制台都有日志:
2017-04-29 22:51:56,235 - ERROR - 30 - database.py - ORA-12170: TNS: 连接超时 2017-04-30 00:10:01,568 - ERROR - 30 - database.py - ORA-12170: TNS:Connect timeout occurred 2017-04-30 00:13:57,726 - ERROR - 30 - database.py - ORA-12170: TNS: 连接超时 2017-04-30 00:15:34,416 - ERROR - 30 - database.py - ORA-12170: TNS:Connect timeout occurred
标签:out ima str img line 多个 basic logging handle
原文地址:http://www.cnblogs.com/huangweimin/p/6789509.html