使用配置文件的 Python 3.2 日志记录导致 KeyError: Raspbian 上的“格式化程序" [英] Python 3.2 logging with config file results in KeyError: 'formatters' on Raspbian

问题描述

我为我的 Python 应用程序配备了日志记录功能，它在我使用 Python 3.4 的 Windows 系统上完美运行.但是当我使用 Raspbian 和 Python 3.2 在我的 Raspberry Pi 上部署应用程序时，我收到以下错误:

I equipped my Python application with logging capability and it works flawlessly on my Windows system with Python 3.4. But when I deploy the application on my Raspberry Pi with Raspbian and Python 3.2, I receive the following error:

Traceback (most recent call last):
  File "aurora/aurora_websocket.py", line 265, in <module>
    logging.config.fileConfig('logging.conf')
  File "/usr/lib/python3.2/logging/config.py", line 70, in fileConfig
    formatters = _create_formatters(cp)
  File "/usr/lib/python3.2/logging/config.py", line 106, in _create_formatters
    flist = cp["formatters"]["keys"]
  File "/usr/lib/python3.2/configparser.py", line 941, in __getitem__
    raise KeyError(key)
KeyError: 'formatters'

logging.conf 文件(以 UTF-8 编码，没有 BOM):

The logging.conf file (encoded in UTF-8 without BOM):

[loggers]
keys=root,simpleExample

[handlers]
keys=screen

[formatters]
keys=simple,complex

[logger_root]
level=NOTSET
handlers=screen

[logger_simpleExample]
level=DEBUG
handlers=screen
qualname=simpleExample
propagate=0

[handler_screen]
class=StreamHandler
level=DEBUG
formatter=complex
args=(sys.stdout,)

[formatter_simple]
format=%(asctime)s - %(levelname)s - %(message)s
datefmt=

[formatter_complex]
format=%(asctime)s - %(levelname)-8s - <%(module)s : %(lineno)d> - %(message)s
datefmt=

日志配置以简单的单行方式加载:

The logging configuration is loaded in a simple one-liner:

logging.config.fileConfig('logging.conf')

我在这里不知所措，因为如上所述，我的应用程序在 Windows 上运行良好，但在 RPi 上失败.

I'm at a loss here, since, as mentioned above already, my application works fine on Windows, but fails on the RPi.

推荐答案

好吧，这并没有持续多久……结果，我一直在 RPi 上从不同的工作目录运行我的应用程序.因此，相对于不同的工作目录，logging.conf 文件的文件路径被错误地解释.不幸的是，日志库尝试继续处理不存在的文件，并且在这种情况下不会抛出有用的异常.

Well, this didn't last long... Turns out, I've been running my application on the RPi from a different working directory. Consequently, the file path to the logging.conf file is interpreted incorrectly relative to the differing working directory. Unfortunately, the logging library tries to continue on with non-existent files and doesn't throw a useful exception in that case.

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