我正在尝试使用logging
为程序创建日志文件。我正在做这样的事情:
if not os.path.exists(r'.\logs'):
os.mkdir(r'.\logs')
logging.basicConfig(filename = rf'.\logs\log_{time.ctime().replace(":", "-").replace(" ", "_")}.log',
format = '%(asctime)s %(name)s %(levelname)s %(message)s',
level = logging.DEBUG)
def foo():
# do stuff ...
logging.debug('Done some stuff')
# do extra stuff ...
logging.debug('Did extra stuff')
# some parallel map that does NOT use logging in the mapping function
logging.debug('Done mapping')
if __name__ == '__main__':
foo()
一切顺利,创建的日志中包含正确的信息:
logs
log_Wed_Feb_14_09-23-32_2018.log
只有最后,由于某种原因,它还会创建2个额外的日志文件并将其留空:
logs
log_Wed_Feb_14_09-23-32_2018.log
log_Wed_Feb_14_09-23-35_2018.log
log_Wed_Feb_14_09-23-39_2018.log
时间戳只相隔几秒钟,但所有日志记录仍然只在第一个日志文件中进行。
为什么这样做?除了删除程序末尾的任何空日志之外,还有办法阻止它给我额外的空文件吗?
答案 0 :(得分:0)
解决。那种。
使用基本配置的行为一直在发生,所以我尝试制作一个自定义记录器类:
class Logger:
"""Class used to encapsulate logging logic."""
__slots__ = ['dir',
'level',
'formatter',
'handler',
'logger']
def __init__(self,
name: str = '',
logdir: str = r'.\logs',
lvl: int = logging.INFO,
fmt: str = '%(asctime)s %(name)s %(levelname)s %(message)s',
hdl: str = rf'.\logs\log_{time.ctime().replace(":", "-").replace(" ", "_")}.log'):
print('construct')
if not os.path.exists(logdir):
os.mkdir(logdir)
self.dir = logdir
self.level = lvl
self.formatter = logging.Formatter(fmt = fmt)
self.handler = logging.FileHandler(filename = hdl)
self.handler.setFormatter(self.formatter)
self.logger = logging.getLogger(name)
self.logger.setLevel(self.level)
self.logger.addHandler(self.handler)
def log(self, msg: str):
"""Logs the given message to the set level of the logger."""
self.logger.log(self.level, msg)
def cleanup(self):
"""Iterates trough the root level of the log folder, removing all log files that have a size of 0."""
for log_file in (rf'{self.dir}\{log}' for log in next(os.walk(self.dir))[2]
if log.endswith('.log') and os.path.getsize(rf'{self.dir}\{log}') is 0):
os.remove(log_file)
def shutdown(self):
"""Prepares and executes the shutdown and cleanul actions."""
logging.shutdown()
self.handler.close()
self.cleanup()
并尝试将其作为参数传递给这样的函数:
def foo(logger = Logger('foo_logger')):
但是这种方法使得每次调用log方法时都会构建一个全新的记录器,它再次允许多个文件。通过使用Logger
的一个实例并将参数默认为None
,我解决了这种情况下多个文件的问题。
然而,最初的基本配置情况仍然是个谜。