2021-01-22 Python TimedRotatingFileHandler 修改suffix后无法自动删除文件
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Python TimedRotatingFileHandler 修改suffix后无法自动删除文件
TimedRotatingFileHandler 用法
“S”: Seconds
“M”: Minutes
“H”: Hours
“D”: Days
“W”: Week day (0=Monday)
“midnight”: Roll over at midnight设计1s一个日志，超过3个删除
log = logging.getLogger()
log.setLevel(logging.ERROR) # 日志等级为ERROR
fh = logging.handlers.TimedRotatingFileHandler("log", when='S', interval=1, backupCount=3)
fh.suffix = "%Y-%m-%d_%H-%M-%S.log"
formatter = logging.Formatter('[%(asctime)s] - %(filename)s [Line:%(lineno)d] - [%(levelname)s]-[thread:%(thread)s]-[process:%(process)s] - %(message)s')
fh.setFormatter(formatter)
log.addHandler(fh)
i = 0
while i < 100000000:
sleep(0.1)
log.error("记录" + str(i))
i = i + 1
结果是并不会删除
查看TimedRotatingFileHandler的源码
def __init__(self, filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False):
BaseRotatingHandler.__init__(self, filename, 'a', encoding, delay)
self.when = when.upper()
self.backupCount = backupCount
self.utc = utc
if self.when == 'S':
self.interval = 1 # one second
self.suffix = "%Y-%m-%d_%H-%M-%S"
self.extMatch = r"^\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}$"
elif self.when == 'M':
self.interval = 60 # one minute
self.suffix = "%Y-%m-%d_%H-%M"
self.extMatch = r"^\d{4}-\d{2}-\d{2}_\d{2}-\d{2}$"
elif self.when == 'H':
self.interval = 60 * 60 # one hour
self.suffix = "%Y-%m-%d_%H"
self.extMatch = r"^\d{4}-\d{2}-\d{2}_\d{2}$"
elif self.when == 'D' or self.when == 'MIDNIGHT':
self.interval = 60 * 60 * 24 # one day
self.suffix = "%Y-%m-%d"
self.extMatch = r"^\d{4}-\d{2}-\d{2}$"
elif self.when.startswith('W'):
self.interval = 60 * 60 * 24 * 7 # one week
if len(self.when) != 2:
raise ValueError("You must specify a day for weekly rollover from 0 to 6 (0 is Monday): %s" % self.when)
if self.when[1] < '0' or self.when[1] > '6':
raise ValueError("Invalid day specified for weekly rollover: %s" % self.when)
self.dayOfWeek = int(self.when[1])
self.suffix = "%Y-%m-%d"
self.extMatch = r"^\d{4}-\d{2}-\d{2}$"
else:
raise ValueError("Invalid rollover interval specified: %s" % self.when)
self.extMatch = re.compile(self.extMatch)
self.interval = self.interval * interval # multiply by units requested
if os.path.exists(filename):
t = os.stat(filename)[ST_MTIME]
else:
t = int(time.time())
self.rolloverAt = self.computeRollover(t)
关键是下面的几行
self.suffix = "%Y-%m-%d_%H-%M-%S"
self.extMatch = r"^\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}$"
······
······
self.extMatch = re.compile(self.extMatch)
默认设置when类型后，suffix是固定的，匹配的正则也是源码里写好的，所以当修改suffix后，必须连带正则一并修改
最终代码如下
log = logging.getLogger()
log.setLevel(logging.ERROR) # 日志等级为ERROR
fh = logging.handlers.TimedRotatingFileHandler("log", when='S', interval=1, backupCount=3)
fh.suffix = "%Y-%m-%d_%H-%M-%S.log"
fh.extMatch = r"^\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}.log$"
fh.extMatch = re.compile(fh.extMatch)
formatter = logging.Formatter('[%(asctime)s] - %(filename)s [Line:%(lineno)d] - [%(levelname)s]-[thread:%(thread)s]-[process:%(process)s] - %(message)s')
fh.setFormatter(formatter)
log.addHandler(fh)
i = 0
while i < 100000000:
sleep(0.1)
log.error("记录" + str(i))
i = i + 1
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