python的log和print的区别_Python3使用logging代替print实现屏幕和文件同时输出

文件列表

Log.py:

# -*- coding: utf-8 -*-

import logging, os

LOG_FILE = 'log.txt'

LOG_FORMAT = "%(message)s"

class Log():

def __init__(self, clean = False):

self.logger = logging.getLogger()

self.logger.setLevel(logging.DEBUG)

formatter = logging.Formatter(LOG_FORMAT)

if clean:

if os.path.isfile(LOG_FILE):

with open(LOG_FILE, 'w') as f:

pass

fh = logging.FileHandler(LOG_FILE)

fh.setLevel(logging.DEBUG)

fh.setFormatter(formatter)

ch = logging.StreamHandler()

ch.setLevel(logging.DEBUG)

ch.setFormatter(formatter)

self.logger.addHandler(ch)

self.logger.addHandler(fh)

def log(self, *args):

s = ''

for i in args:

s += (str(i) + ' ')

logging.debug(s)

log = Log(True)

def test():

log.log('aaa')

log.log('bbb', 3)

log.log('ccc %.2f CCC' % (3.1415926))

log.log('ddd', 'ee %.2f fff' % (3.1415926))

if __name__ == '__main__':

test()

>python Log.py

aaa

bbb 3

ccc 3.14 CCC

ddd ee 3.14 fff

test.ypy

from Log import log

def test():

log.log('aaa')

log.log('bbb', 3)

log.log('ccc %.2f CCC' % (3.1415926))

log.log('ddd', 'ee %.2f fff' % (3.1415926))

if __name__ == '__main__':

test()

>python Log.py

aaa

bbb 3

ccc 3.14 CCC

ddd ee 3.14 fff

log文件内容