python中用修饰器进行异常日志记录

python

当脚本中需要进行的的相同的异常操作很多的时候,可以用修饰器来简化代码。比如我需要记录抛出的异常:

在log_exception.py文件中,

python">import functools

import logging

def create_logger():

logger = logging.getLogger("test_log")

logger.setLevel(logging.INFO)

fh = logging.FileHandler("test.log")

fmt = "[%(asctime)s-%(name)s-%(levelname)s]: %(message)s"

formatter = logging.Formatter(fmt)

fh.setFormatter(formatter)

logger.addHandler(fh)

return logger

def log_exception(fn):

@functools.wraps(fn)

def wrapper(*args, **kwargs):

logger = create_logger()

try:

fn(*args, **kwargs)

except Exception as e:

logger.exception("[Error in {}] msg: {}".format(__name__, str(e)))

raise

return wrapper

在test.py文件中:

from log_exception import log_exception

@log_exception

def reciprocal(x):

return 1/x

if __name__ == "__main__":

reciprocal(0)

在test.log文件中可以看到以下错误信息:

[2017-11-26 23:37:41,012-test_log-ERROR]: [Error in __main__] msg: integer division or modulo by zero

Traceback (most recent call last):

File "<ipython-input-43-cfa2d18586a3>", line 16, in wrapper

fn(*args, **kwargs)

File "<ipython-input-46-37aa8ff0ba48>", line 3, in reciprocal

return 1/x

ZeroDivisionError: integer division or modulo by zero

参考:

  1. https://wiki.python.org/moin/PythonDecorators
  2. https://www.blog.pythonlibrary.org/2016/06/09/python-how-to-create-an-exception-logging-decorator/

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