logging 日志

https://docs.python.org/zh-cn/3/howto/logging-cookbook.html#logging-cookbook

在多个模块中使用日志

多次调用 logging.getLogger('someLogger') 时会返回对同一个 logger 对象的引用。 这不仅是在同一个模块中，在其他模块调用也是如此，只要是在同一个 Python 解释器进程中。 是应该引用同一个对象，此外，应用程序也可以在一个模块中定义和配置父 logger，而在单独的模块中创建（但不配置）子 logger，对子 logger 的所有调用都将传给父 logger。 这里是主模块:

import logging
import auxiliary_module

# create logger with 'spam_application'
logger = logging.getLogger('spam_application')
logger.setLevel(logging.DEBUG)
# create file handler which logs even debug messages
fh = logging.FileHandler('spam.log')
fh.setLevel(logging.DEBUG)
# create console handler with a higher log level
ch = logging.StreamHandler()
ch.setLevel(logging.ERROR)
# create formatter and add it to the handlers
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
fh.setFormatter(formatter)
ch.setFormatter(formatter)
# add the handlers to the logger
logger.addHandler(fh)
logger.addHandler(ch)

logger.info('creating an instance of auxiliary_module.Auxiliary')
a = auxiliary_module.Auxiliary()
logger.info('created an instance of auxiliary_module.Auxiliary')
logger.info('calling auxiliary_module.Auxiliary.do_something')
a.do_something()
logger.info('finished auxiliary_module.Auxiliary.do_something')
logger.info('calling auxiliary_module.some_function()')
auxiliary_module.some_function()
logger.info('done with auxiliary_module.some_function()')

 这里是辅助模块:

 

import logging

# create logger
module_logger = logging.getLogger('spam_application.auxiliary')

class Auxiliary:
    def __init__(self):
        self.logger = logging.getLogger('spam_application.auxiliary.Auxiliary')
        self.logger.info('creating an instance of Auxiliary')

    def do_something(self):
        self.logger.info('doing something')
        a = 1 + 1
        self.logger.info('done doing something')

def some_function():
    module_logger.info('received a call to "some_function"')

 

 输出结果如下：

2005-03-23 23:47:11,663 - spam_application - INFO -
   creating an instance of auxiliary_module.Auxiliary
2005-03-23 23:47:11,665 - spam_application.auxiliary.Auxiliary - INFO -
   creating an instance of Auxiliary
2005-03-23 23:47:11,665 - spam_application - INFO -
   created an instance of auxiliary_module.Auxiliary
2005-03-23 23:47:11,668 - spam_application - INFO -
   calling auxiliary_module.Auxiliary.do_something
2005-03-23 23:47:11,668 - spam_application.auxiliary.Auxiliary - INFO -
   doing something
2005-03-23 23:47:11,669 - spam_application.auxiliary.Auxiliary - INFO -
   done doing something
2005-03-23 23:47:11,670 - spam_application - INFO -
   finished auxiliary_module.Auxiliary.do_something
2005-03-23 23:47:11,671 - spam_application - INFO -
   calling auxiliary_module.some_function()
2005-03-23 23:47:11,672 - spam_application.auxiliary - INFO -
   received a call to 'some_function'
2005-03-23 23:47:11,673 - spam_application - INFO -
   done with auxiliary_module.some_function()

 

#coding:utf-8

import logging, time
import os

cur_path = os.path.dirname(os.path.realpath(__file__))
project_path = os.path.dirname(cur_path)
log_path = os.path.join(project_path, 'logs')


class Log():
    def __init__(self):
        # 日志文件的命名
        self.logname = os.path.join(log_path, '%s.log'%time.strftime('%Y_%m_%d_%H_%M_%S'))
        self.logger = logging.getLogger()
        self.logger.setLevel(logging.DEBUG)
        #日志输出格式
        self.formatter = logging.Formatter('[%(asctime)s] - %(filename)s] - %(levelname)s: %(message)s')

    def __console(self, level, message):
        # 创建一个FileHandler，用于写到本地
        fh = logging.FileHandler(self.logname, 'a')  # 追加模式  这个是python2的
        # fh = logging.FileHandler(self.logname, 'a', encoding='utf-8')  # 这个是python3的
        fh.setLevel(logging.DEBUG)
        fh.setFormatter(self.formatter)
        self.logger.addHandler(fh)

        # 创建一个StreamHandler,用于输出到控制台
        ch = logging.StreamHandler()
        ch.setLevel(logging.DEBUG)
        ch.setFormatter(self.formatter)
        self.logger.addHandler(ch)

        if level == 'info':
            self.logger.info(message)
        elif level == 'debug':
            self.logger.debug(message)
        elif level == 'warning':
            self.logger.warning(message)
        elif level == 'error':
            self.logger.error(message)
        # 这两行代码是为了避免日志输出重复问题
        self.logger.removeHandler(ch)
        self.logger.removeHandler(fh)
        # 关闭打开的文件
        fh.close()

    def debug(self, message):
        self.__console('debug', message)

    def info(self, message):
        self.__console('info', message)

    def warning(self, message):
        self.__console('warning', message)

    def error(self, message):
        self.__console('error', message)

if __name__ == "__main__":
   log = Log()
   log.info(u"---测试开始----")
   log.info(u"操作步骤1,2,3")
   log.warning(u"----测试结束----")