如何使用Python中的日志记录模块写入文件?每次我尝试使用它,它就会打印出信息。
当前回答
import sys
import logging
from util import reducer_logfile
logging.basicConfig(filename=reducer_logfile, format='%(message)s',
level=logging.INFO, filemode='w')
其他回答
http://docs.python.org/library/logging.handlers.html#filehandler
FileHandler类位于核心日志包中,它将日志输出发送到磁盘文件。
import sys
import logging
from util import reducer_logfile
logging.basicConfig(filename=reducer_logfile, format='%(message)s',
level=logging.INFO, filemode='w')
最好干净的方法。
ds = datetime.now().strftime("%Y%m%d_%H%M%S")
try:
# py39 有force参数指定可能强制除去之前的handler,这里使用兼容写法,0708
logging.getLogger().removeHandler(logging.getLogger().handlers[0])
logging.getLogger().removeHandler(logging.getLogger().handlers[0])
except:
pass
logging.basicConfig(
# force=
level=logging.INFO,
format="%(asctime)s [%(levelname)s] %(message)s",
handlers=[
logging.FileHandler('log_%s_%s_%s.log' % (ds, create_net, os.path.basename(dataset_path))),
logging.StreamHandler(sys.stdout)
]
)
logging.info('start train')
我更喜欢使用配置文件。它允许我在从开发到发布的过程中切换日志级别、位置等,而无需更改代码。我只是用相同的名称打包了一个不同的配置文件,并定义了相同的记录器。
import logging.config
if __name__ == '__main__':
# Configure the logger
# loggerConfigFileName: The name and path of your configuration file
logging.config.fileConfig(path.normpath(loggerConfigFileName))
# Create the logger
# Admin_Client: The name of a logger defined in the config file
mylogger = logging.getLogger('Admin_Client')
msg='Bite Me'
myLogger.debug(msg)
myLogger.info(msg)
myLogger.warn(msg)
myLogger.error(msg)
myLogger.critical(msg)
# Shut down the logger
logging.shutdown()
下面是日志配置文件的代码
#These are the loggers that are available from the code
#Each logger requires a handler, but can have more than one
[loggers]
keys=root,Admin_Client
#Each handler requires a single formatter
[handlers]
keys=fileHandler, consoleHandler
[formatters]
keys=logFormatter, consoleFormatter
[logger_root]
level=DEBUG
handlers=fileHandler
[logger_Admin_Client]
level=DEBUG
handlers=fileHandler, consoleHandler
qualname=Admin_Client
#propagate=0 Does not pass messages to ancestor loggers(root)
propagate=0
# Do not use a console logger when running scripts from a bat file without a console
# because it hangs!
[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=consoleFormatter
args=(sys.stdout,)# The comma is correct, because the parser is looking for args
[handler_fileHandler]
class=FileHandler
level=DEBUG
formatter=logFormatter
# This causes a new file to be created for each script
# Change time.strftime("%Y%m%d%H%M%S") to time.strftime("%Y%m%d")
# And only one log per day will be created. All messages will be amended to it.
args=("D:\\Logs\\PyLogs\\" + time.strftime("%Y%m%d%H%M%S")+'.log', 'a')
[formatter_logFormatter]
#name is the name of the logger root or Admin_Client
#levelname is the log message level debug, warn, ect
#lineno is the line number from where the call to log is made
#04d is simple formatting to ensure there are four numeric places with leading zeros
#4s would work as well, but would simply pad the string with leading spaces, right justify
#-4s would work as well, but would simply pad the string with trailing spaces, left justify
#filename is the file name from where the call to log is made
#funcName is the method name from where the call to log is made
#format=%(asctime)s | %(lineno)d | %(message)s
#format=%(asctime)s | %(name)s | %(levelname)s | %(message)s
#format=%(asctime)s | %(name)s | %(module)s-%(lineno) | %(levelname)s | %(message)s
#format=%(asctime)s | %(name)s | %(module)s-%(lineno)04d | %(levelname)s | %(message)s
#format=%(asctime)s | %(name)s | %(module)s-%(lineno)4s | %(levelname)-8s | %(message)s
format=%(asctime)s | %(levelname)-8s | %(lineno)04d | %(message)s
#Use a separate formatter for the console if you want
[formatter_consoleFormatter]
format=%(asctime)s | %(levelname)-8s | %(filename)s-%(funcName)s-%(lineno)04d | %(message)s
http://docs.python.org/library/logging.html#logging.basicConfig
logging.basicConfig(filename='/path/to/your/log', level=....)
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