Python 如何让记录器在再次写入之前删除现有的日志文件？
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How do I get logger to delete existing log file before writing to it again?
提问by Paul H
Using the configuration below, my logfile will be called 'test-debug.log' and it will grow infinitely for everytime I run the script. I just want this logfile to contain the log records from the most recent run of the script. The log should be deleted before starting again.
使用下面的配置，我的日志文件将被称为“test-debug.log”，并且每次运行脚本时它都会无限增长。我只希望这个日志文件包含最近运行脚本的日志记录。在重新开始之前应该删除日志。
How do I do that?
我怎么做？
logger = logging.getLogger('test') #Create a log with the same name as the script that created it
logger.setLevel('DEBUG')
#Create handlers and set their logging level
filehandler_dbg = logging.FileHandler(logger.name + '-debug.log')
filehandler_dbg.setLevel('DEBUG')
#Create custom formats of the logrecord fit for both the logfile and the console
streamformatter = logging.Formatter(fmt='%(levelname)s:\t%(threadName)s:\t%(funcName)s:\t\t%(message)s', datefmt='%H:%M:%S') #We only want to see certain parts of the message
#Apply formatters to handlers
filehandler_dbg.setFormatter(streamformatter)
#Add handlers to logger
logger.addHandler(filehandler_dbg)
采纳答案by dmcc
Try this:
尝试这个：
filehandler_dbg = logging.FileHandler(logger.name + '-debug.log', mode='w')
to open the filename in writemode instead of appendmode, clobbering logger.name
以write模式而不是append模式打开文件名，破坏logger.name
More information: logging.FileHandlerdocs, open()and list of modes
回答by Sumit Kumar
If you are using any external configuration file then pass 'w' for write mode in args of the handler.
如果您使用任何外部配置文件，则在处理程序的 args 中为写入模式传递“w”。
[loggers]
keys=root
[logger_root]
level=DEBUG
handlers=file_handler
[handlers]
keys=file_handler
[handler_file_handler]
class=FileHandler
formatter=formatter
args=("../log/test" + time.strftime("%%Y%%m%%d%%H%%M%%S") + '.log', 'w')
[formatters]
keys=formatter
[formatter_formatter]
format=%(asctime)s %(levelname)-5s [%(module)s] %(message)s
