Python. logging

import logging
logger = logging.getLogger('test')
logger.setLevel(logging.INFO)
#设置日志输出格式
fmt = logging.Formatter('%(name)s - %(levelname)s -%(asctime)s - %(message)s')

#添加StreamHandler
stream_hdl = logging.StreamHandler()
stream_hdl.setLevel(logging.WARNING)
logger.addHandler(stream_hdl)

#添加FileHandler
file_hd1 = logging.FileHandler('/Users/nali/Downloads/test/test0821.log')
file_hd1.setLevel(logging.DEBUG)
file_hd1.setFormatter(fmt)
logger.addHandler(file_hd1)


logger.warning('<warning> message.')
logger.info('<info> message.')
logger.debug('<debug> message.')

 logger的format格式参数

%(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)
%(lineno)d ——Source line number where the logging call was issued(if available)
%(funcName)s ——Function name
%(created)f ——Time when the LogRecord was created (time.time() return value)
%(asctime)s ——Textual time when the LogRecord was created
%(msecs)d ——Millisecond portion of the creation time
%(relativeCreated)d ——Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded (typically at application startup time)
%(thread)d ——Thread ID (if available)
%(threadName)s ——Thread name (if available)
%(process)d ——Process ID (if available)
%(message)s ——The result of record.getMessage(), computed just as the record is emitted

 也可以给Formatter传入第二个参数，修改日期格式，比如 %Y-%m-%d ，则输出的log就没有时分秒了。