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
这个例子应该可以正常工作。我已经为控制台添加了流处理器。控制台 日志和文件处理程序数据应该相似。
# MUTHUKUMAR_TIME_DATE.py #>>>>>>>> file name(module)
import sys
import logging
import logging.config
# ================== Logger ================================
def Logger(file_name):
formatter = logging.Formatter(fmt='%(asctime)s %(module)s,line: %(lineno)d %(levelname)8s | %(message)s',
datefmt='%Y/%m/%d %H:%M:%S') # %I:%M:%S %p AM|PM format
logging.basicConfig(filename = '%s.log' %(file_name),format= '%(asctime)s %(module)s,line: %(lineno)d %(levelname)8s | %(message)s',
datefmt='%Y/%m/%d %H:%M:%S', filemode = 'w', level = logging.INFO)
log_obj = logging.getLogger()
log_obj.setLevel(logging.DEBUG)
# log_obj = logging.getLogger().addHandler(logging.StreamHandler())
# console printer
screen_handler = logging.StreamHandler(stream=sys.stdout) #stream=sys.stdout is similar to normal print
screen_handler.setFormatter(formatter)
logging.getLogger().addHandler(screen_handler)
log_obj.info("Logger object created successfully..")
return log_obj
# =======================================================
MUTHUKUMAR_LOGGING_CHECK.py #>>>>>>>>>>> file name
# calling **Logger** function
file_name = 'muthu'
log_obj =Logger(file_name)
log_obj.info("yes hfghghg ghgfh".format())
log_obj.critical("CRIC".format())
log_obj.error("ERR".format())
log_obj.warning("WARN".format())
log_obj.debug("debug".format())
log_obj.info("qwerty".format())
log_obj.info("asdfghjkl".format())
log_obj.info("zxcvbnm".format())
# closing file
log_obj.handlers.clear()
OUTPUT:
2019/07/13 23:54:40 MUTHUKUMAR_TIME_DATE,line: 17 INFO | Logger object created successfully..
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 8 INFO | yes hfghghg ghgfh
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 9 CRITICAL | CRIC
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 10 ERROR | ERR
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 11 WARNING | WARN
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 12 DEBUG | debug
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 13 INFO | qwerty
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 14 INFO | asdfghjkl
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 15 INFO | zxcvbnm
Thanks,
其他回答
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')
import sys
import logging
from util import reducer_logfile
logging.basicConfig(filename=reducer_logfile, format='%(message)s',
level=logging.INFO, filemode='w')
这个例子应该可以正常工作。我已经为控制台添加了流处理器。控制台 日志和文件处理程序数据应该相似。
# MUTHUKUMAR_TIME_DATE.py #>>>>>>>> file name(module)
import sys
import logging
import logging.config
# ================== Logger ================================
def Logger(file_name):
formatter = logging.Formatter(fmt='%(asctime)s %(module)s,line: %(lineno)d %(levelname)8s | %(message)s',
datefmt='%Y/%m/%d %H:%M:%S') # %I:%M:%S %p AM|PM format
logging.basicConfig(filename = '%s.log' %(file_name),format= '%(asctime)s %(module)s,line: %(lineno)d %(levelname)8s | %(message)s',
datefmt='%Y/%m/%d %H:%M:%S', filemode = 'w', level = logging.INFO)
log_obj = logging.getLogger()
log_obj.setLevel(logging.DEBUG)
# log_obj = logging.getLogger().addHandler(logging.StreamHandler())
# console printer
screen_handler = logging.StreamHandler(stream=sys.stdout) #stream=sys.stdout is similar to normal print
screen_handler.setFormatter(formatter)
logging.getLogger().addHandler(screen_handler)
log_obj.info("Logger object created successfully..")
return log_obj
# =======================================================
MUTHUKUMAR_LOGGING_CHECK.py #>>>>>>>>>>> file name
# calling **Logger** function
file_name = 'muthu'
log_obj =Logger(file_name)
log_obj.info("yes hfghghg ghgfh".format())
log_obj.critical("CRIC".format())
log_obj.error("ERR".format())
log_obj.warning("WARN".format())
log_obj.debug("debug".format())
log_obj.info("qwerty".format())
log_obj.info("asdfghjkl".format())
log_obj.info("zxcvbnm".format())
# closing file
log_obj.handlers.clear()
OUTPUT:
2019/07/13 23:54:40 MUTHUKUMAR_TIME_DATE,line: 17 INFO | Logger object created successfully..
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 8 INFO | yes hfghghg ghgfh
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 9 CRITICAL | CRIC
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 10 ERROR | ERR
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 11 WARNING | WARN
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 12 DEBUG | debug
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 13 INFO | qwerty
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 14 INFO | asdfghjkl
2019/07/13 23:54:40 MUTHUKUMAR_LOGGING_CHECK,line: 15 INFO | zxcvbnm
Thanks,
这里有两个例子，一个打印日志(stdout)，另一个将日志写入文件:
import logging
import sys
logger = logging.getLogger()
logger.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s | %(levelname)s | %(message)s')
stdout_handler = logging.StreamHandler(sys.stdout)
stdout_handler.setLevel(logging.DEBUG)
stdout_handler.setFormatter(formatter)
file_handler = logging.FileHandler('logs.log')
file_handler.setLevel(logging.DEBUG)
file_handler.setFormatter(formatter)
logger.addHandler(file_handler)
logger.addHandler(stdout_handler)
在这个示例中，所有日志都将被打印出来，并被写入一个名为logs.log的文件
使用的例子:
logger.info('This is a log message!')
logger.error('This is an error message.')
所有内置日志处理程序的列表https://docs.python.org/3/library/logging.handlers.html
一个使用日志记录的例子。使用basicConfig而不是logging.fileHandler()
logging.basicConfig(filename=logname,
filemode='a',
format='%(asctime)s,%(msecs)d %(name)s %(levelname)s %(message)s',
datefmt='%H:%M:%S',
level=logging.DEBUG)
logging.info("Running Urban Planning")
logger = logging.getLogger('urbanGUI')
按顺序，这五个部分做以下工作:
设置输出文件(filename=logname) 将其设置为追加而不是覆盖(filemode='a') 确定输出消息的格式(format=…) 确定输出时间的格式(datefmt='%H:%M:%S') 并确定它将接受的最小消息级别(level=logging.DEBUG)。
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