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，该脚本接收所有错误并将它们记录到日志文件中.我想在这个文件中包含任何 argparse 错误.我已经使用 logging 包和 sys.excepthook 来驱动日志文件的意外异常.

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.

这是一个示例代码:

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.如果我运行 python logger_argparse.py a 我会在控制台中得到输出而不是日志文件:

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'

如何获取该信息以转到日志文件?

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

推荐答案

你可以使用 logging.exception 在异常处理程序中?那么只从 ArgumentParser.error() 记录怎么样?

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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