python 实现logging动态变更输出日志文件名

log_fmt = '%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s'
for i in range(1,4):
 filename = str.format('mylog%d.txt' % i)
 logging.basicConfig(format=log_fmt, level=logging.DEBUG, filename=filename)
 logging.debug('This is debug message')
 logging.info('This is info message')
 logging.warning('This is warning message')

# 默认配置logging写入本地文件
logging.basicConfig(level=logging.DEBUG,
  format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
  datefmt='%a, %d %b %Y %H:%M:%S',
  filename='myapp2.log',
  filemode='w')
#定义一个StreamHandler，将INFO级别或更高的日志信息打印到标准错误，并将其添加到当前的日志处理对象。
console = logging.StreamHandler()
console.setLevel(logging.INFO)
formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
console.setFormatter(formatter)
logging.getLogger('').addHandler(console)
logging.debug('This is debug message')
logging.info('This is info message')
logging.warning('This is warning message')

# 默认配置logging写入本地文件
logging.basicConfig(level=logging.DEBUG,
  format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
  datefmt='%a, %d %b %Y %H:%M:%S',
  filename='myapp2.log',
  filemode='w')
#定义一个StreamHandler，将INFO级别或更高的日志信息打印到标准错误，并将其添加到当前的日志处理对象。
console = logging.StreamHandler()
console.setLevel(logging.INFO)
formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
console.setFormatter(formatter)
logging.getLogger('').addHandler(console)
logging.debug('This is debug message')
logging.info('This is info message')
logging.warning('This is warning message')

import logging, logging.handlers
import time
'''
TimedRotatingFileHandler构造函数声明
class logging.handlers.TimedRotatingFileHandler(filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False, atTime=None)
filename 日志文件名前缀
when 日志名变更时间单位
 'S' Seconds
 'M' Minutes
 'H' Hours
 'D' Days
 'W0'-'W6' Weekday (0=Monday)
 'midnight' Roll over at midnight
interval 间隔时间，是指等待N个when单位的时间后，自动重建文件
backupCount 保留日志最大文件数，超过限制，删除最先创建的文件；默认值0，表示不限制。
delay 延迟文件创建，直到第一次调用emit()方法创建日志文件
atTime 在指定的时间（datetime.time格式）创建日志文件。
'''
def test_TimedRotatingFileHandler():
 # 定义日志输出格式
 fmt_str = '%(asctime)s[level-%(levelname)s][%(name)s]:%(message)s'
 # 初始化
 logging.basicConfig()
 # 创建TimedRotatingFileHandler处理对象
 # 间隔5(S)创建新的名称为myLog%Y%m%d_%H%M%S.log的文件，并一直占用myLog文件。
 fileshandle = logging.handlers.TimedRotatingFileHandler('myLog', when='S', interval=5, backupCount=3)
 # 设置日志文件后缀，以当前时间作为日志文件后缀名。
 fileshandle.suffix = "%Y%m%d_%H%M%S.log"
 # 设置日志输出级别和格式
 fileshandle.setLevel(logging.DEBUG)
 formatter = logging.Formatter(fmt_str)
 fileshandle.setFormatter(formatter)
 # 添加到日志处理对象集合
 logging.getLogger('').addHandler(fileshandle)
if __name__ == '__main__':
 test_TimedRotatingFileHandler()
 # 测试在200s内创建文件多个日志文件
 for i in range(0, 100):
 logging.debug("logging.debug")
 logging.info("logging.info")
 logging.warning("logging.warning")
 logging.error("logging.error")
 time.sleep(2)

[loggers]
keys=root,fileLogger,rotatingFileLogger
 
[handlers]
keys=consoleHandler,fileHandler,rotatingFileHandler
 
[formatters]
keys=simpleFormatter
 
[logger_root]
level=DEBUG
handlers=consoleHandler
 
[logger_fileLogger]
level=DEBUG
# 该logger中配置的handler
handlers=fileHandler
# logger 的名称
qualname=fileLogger
propagate=0
 
[logger_rotatingFileLogger]
level=DEBUG
# 这样配置，rotatingFileLogger中就同时配置了consoleHandler,rotatingFileHandler
# consoleHandler 负责将日志输出到控制台
# rotatingFileHandler 负责将日志输出保存到文件中
handlers=consoleHandler,rotatingFileHandler
qualname=rotatingFileLogger
propagate=0
 
[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)
 
[handler_fileHandler]
class=FileHandler
level=DEBUG
formatter=simpleFormatter
args=('logs/logging.log', 'a')
 
[handler_rotatingFileHandler]
class=handlers.RotatingFileHandler
level=WARNING
formatter=simpleFormatter
args=("logs/rotating_logging.log", "a", 1*1024*1024, 5)
 
[formatter_simpleFormatter]
#format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
format=%(asctime)s - %(module)s - %(thread)d - %(levelname)s : %(message)s
datefmt=%Y-%m-%d %H:%M:%S

logging.config.fileConfig(“logging.conf”)
 
# 输出日志到控制台,获取的是root对应的logger
console_logger = logging.getLogger()
 
# 输出日志到单个文件
file_logger = logging.getLogger(name="fileLogger")
 
# rotatingFileLogger中额consoleHandler输出到控制台，rotatingHandler输出日志到文件
rotating_logger = logging.getLogger(name="rotatingFileLogger")