Python argparse错误到文件 [英] Python argparse errors to file

问题描述

我正在尝试制作一个脚本，以接收所有错误并将其记录到日志文件中.我想在此文件中包含任何argparse错误.我已经使用logging包和sys.excepthook将意外的异常驱动到日志文件.

I am trying to make a script that takes all errors and logs them to a log file. I want to include any argparse errors to this file. I already use the logging package and a sys.excepthook to drive unexpected exceptions to the log file.

这是示例代码:

import argparse
import logging
import sys
import traceback

def log_uncaught_exceptions(ex_cls, ex, tb):
    logging.critical(''.join(traceback.format_tb(tb)))
    logging.critical('{0}: {1}'.format(ex_cls, ex))

logging.basicConfig(
    level=logging.DEBUG,
    filename='foo.log',
    filemode='w',
    format='%(asctime)s - %(levelname)s - %(message)s')

sys.excepthook = log_uncaught_exceptions

logging.debug('This is a typical debug line')

parser = argparse.ArgumentParser(description='Foo String')
parser.add_argument('foo',type=int)
args = parser.parse_args()
logging.debug('Input was %i'%(args.foo))

当我使用python logger_argparse.py 1运行它时，一切都很好.如果运行python logger_argparse.py a，我将在控制台中获得输出，而不是日志文件中的输出:

When I run it with python logger_argparse.py 1 everything works great. If I run python logger_argparse.py a I get the output in the console and not the log file:

usage: logger_argparse.py [-h] foo
logger_argparse.py: error: argument foo: invalid int value: 'a'

如何获取该信息以进入日志文件?

How do I get that information to go to the log file?

推荐答案

您可以使用 logging.exception 在异常处理程序中? 那么仅从ArgumentParser.error()登录怎么办?

Can you use logging.exception in an exception handler? so how about just logging from ArgumentParser.error()?

import sys
import logging
import argparse

class argparse_logger(argparse.ArgumentParser):
    def error(self, message):
        logging.error(message)
        super().error(message)

logging.basicConfig(
    level=logging.DEBUG,
    filename='foo.log',
    filemode='w',
    format='%(asctime)s - %(levelname)s - %(message)s')

# parser = argparse.ArgumentParser(description="Foo")
parser = argparse_logger(description="Foo")
parser.add_argument('foo',type=int)
logging.debug("Start")

try:
    args = parser.parse_args(sys.argv[1:])
except:
    print("Error handling arguments")
    raise
logging.debug(f"Finish - {args.foo}")
print(f"Exiting! - {args.foo}")

这将显示以下内容:

J:\>python arg_parse_log.py 5
Exiting! - 5

J:\>more foo.log
2018-02-07 11:34:45,647 - DEBUG - Start
2018-02-07 11:34:45,648 - DEBUG - Finish - 5

J:\>python arg_parse_log.py
usage: arg_parse_log.py [-h] foo
arg_parse_log.py: error: the following arguments are required: foo
Error handling arguments

J:\>more foo.log
2018-02-07 11:34:54,577 - DEBUG - Start
2018-02-07 11:34:54,578 - ERROR - the following arguments are required: foo

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