模塊級函數

logging.getLogger([name]):返回一個logger對象，如果沒有指定名字將返回root logger
logging.debug()、logging.info()、logging.warning()、logging.error()、logging.critical()：設定root logger的日志級別
logging.basicConfig():用默認Formatter為日志系統建立一個StreamHandler，設置基礎配置并加到root logger中

示例：logging_level_example.py
代碼如下:
import logging
import sys

LEVELS = {'debug': logging.DEBUG,
          'info': logging.INFO,
          'warning': logging.WARNING,
          'error': logging.ERROR,
          'critical': logging.CRITICAL}

if len(sys.argv) > 1:
    level_name = sys.argv[1]
    level = LEVELS.get(level_name, logging.NOTSET)
    logging.basicConfig(level=level)

logging.debug('This is a debug message')
logging.info('This is an info message')
logging.warning('This is a warning message')
logging.error('This is an error message')
logging.critical('This is a critical error message')

輸出：
代碼如下:
$ python logging_level_example.py debug
DEBUG:root:This is a debug message
INFO:root:This is an info message
WARNING:root:This is a warning message
ERROR:root:This is an error message
CRITICAL:root:This is a critical error message

$ python logging_level_example.py info
INFO:root:This is an info message
WARNING:root:This is a warning message
ERROR:root:This is an error message
CRITICAL:root:This is a critical error message

Loggers

Logger.setLevel(lel):指定最低的日志級別，低于lel的級別將被忽略。debug是最低的內置級別，critical為最高
Logger.addFilter(filt)、Logger.removeFilter(filt):添加或刪除指定的filter
Logger.addHandler(hdlr)、Logger.removeHandler(hdlr)：增加或刪除指定的handler
Logger.debug()、Logger.info()、Logger.warning()、Logger.error()、Logger.critical()：可以設置的日志級別

示例：simple_logging_module.py
代碼如下:
import logging

# create logger
logger = logging.getLogger("simple_example")
logger.setLevel(logging.DEBUG)

# create console handler and set level to debug
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)

# create formatter
formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")

# add formatter to ch
ch.setFormatter(formatter)

# add ch to logger
logger.addHandler(ch)

# "application" code
logger.debug("debug message")
logger.info("info message")
logger.warn("warn message")
logger.error("error message")
logger.critical("critical message")

輸出：
代碼如下:
$ python simple_logging_module.py
2005-03-19 15:10:26,618 - simple_example - DEBUG - debug message