你为什么不把这句话放在www.example.com的末尾settings.py，并使用DEBUG标志进行开发？
就像这样：

import logging   
import logging.handlers
logger = logging.getLogger('project_logger')
logger.setLevel(logging.INFO)

[snip]
if DEBUG:
    LOG_FILENAME = '/path/to/log/file/in/development/environment'
else:
    LOG_FILENAME = '/path/to/log/file/in/production/environment'

handler = logging.handlers.TimedRotatingFileHandler(LOG_FILENAME, when = 'midnight')
formatter = logging.Formatter(LOG_MSG_FORMAT)
handler.setFormatter(formatter)
logger.addHandler(handler)

找到了一个合理的“DRY”解决方案。感谢Django中的Python日志
我现在有一个log.py，它看起来像这样：

import logging, logging.handlers
from django.conf import settings

LOGGING_INITIATED = False
LOGGER_NAME = 'project_logger'

def init_logging():
    logger = logging.getLogger(LOGGER_NAME)
    logger.setLevel(logging.INFO)
    handler = logging.handlers.TimedRotatingFileHandler(settings.LOG_FILENAME, when = 'midnight')
    formatter = logging.Formatter(LOG_MSG_FORMAT)
    handler.setFormatter(formatter)
    logger.addHandler(handler)

if not LOGGING_INITIATED:
    LOGGING_INITIATED = True
    init_logging()

我的settings.py现在包含

LOG_FILENAME = '/path/to/log/file/in/development/environment

production.py包含：

from settings import *
LOG_FILENAME = '/path/to/log/file/in/production/environment'