NameError：未定义全局名称“logger”

Question

我编写了一个logging.json文件，其中设置了日志配置，之后我创建了一个类，其中我的所有方法都将在那里，但是当我在类中使用记录器时，它会抛出错误

NameError: global name 'logger' is not defined

app.py

#/usr/bin/python

import sys
import logging
import time
import json
import os
import logging.config

def setup_logging(default_path='logging.json',default_level=logging.INFO,env_key='LOG_CFG'):
    """Setup logging configuration"""
    path = default_path
    value = os.getenv(env_key, None)
    if value:
        path = value
    if os.path.exists(path):
        with open(path, 'rt') as f:
            config = json.load(f)
        logging.config.dictConfig(config)
    else:
        logging.basicConfig(level=default_level)

class Generic:

        def __init__(self , file_path):
                self.file_path = file_path

        def check_mime(self):
                logger.info('Generic on file {} starts at {}'.format(file_path , time.time()))


print 'File path is {}'.format(sys.argv[1])
file_path = sys.argv[1]

def parser():
        parser = Generic(file_path)
        parser.check_mime()
def main():
        print 'This is intended for module purpose only'
        setup_logging()
        parser()

if __name__ == '__main__':
        main()

logging.json

{
    "version": 1,
    "disable_existing_loggers": false,
    "formatters": {
        "simple": {
            "format": "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
        }
    },

    "handlers": {
        "console": {
            "class": "logging.StreamHandler",
            "level": "DEBUG",
            "formatter": "simple",
            "stream": "ext://sys.stdout"
        },

        "info_file_handler": {
            "class": "logging.handlers.RotatingFileHandler",
            "level": "INFO",
            "formatter": "simple",
            "filename": "logs/gp.log",
            "maxBytes": 10485760,
            "backupCount": 20,
            "encoding": "utf8"
        },

        "error_file_handler": {
            "class": "logging.handlers.RotatingFileHandler",
            "level": "ERROR",
            "formatter": "simple",
            "filename": "logs/errors.log",
            "maxBytes": 10485760,
            "backupCount": 20,
            "encoding": "utf8"
        }
    },

    "loggers": {
        "my_module": {
            "level": "ERROR",
            "handlers": ["console"],
            "propagate": "no"
        }
    },

    "root": {
        "level": "INFO",
        "handlers": ["console", "info_file_handler", "error_file_handler"]
    }
}

问题：

当我运行程序时出错

$ python app.py /home/default/domain.txt
File path is /home/default/domain.txt
This is intended for module purpose only
Traceback (most recent call last):
  File "app.py", line 44, in <module>
    main()
  File "app.py", line 41, in main
    parser()
  File "app.py", line 37, in parser
    parser.check_mime()
  File "app.py", line 29, in check_mime
    logger.info('GenericParser
NameError: global name 'logger' is not defined

我使用此链接中的日志记录示例[https://fangpenlin.com/posts/2012/08/26/good-logging-practice-in-python/]

有关如何解决此问题的任何建议，因为记录器不是全局的，有什么方法可以使其全局。？

Answer 1

您链接到的示例有：

import logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__) #<<<<<<<<<<<<<<<<<<<<

您错过了

logger

的定义。

您可以将

self.logger = logging.getLogger(__name__)

放入

Generic.__init__()

函数中，或者在导入后立即定义一个全局

logger

，如示例中所示。

Answer 2

下面的内容应该添加到您的代码中

logger=None
def setup():
   logger.debug('put some text')
   return 0

def main():
   global logger
   logger = logging.getLogger('give_some_logger_name')
   logger.setLevel(logging.DEBUG)

   ret = setup()

Answer 3

在您的班级中您正在使用记录器，但您尚未定义它。 将记录器设置为：

    logger = logging.getLogger(__name__)

或使用日志记录代替：

    logging.info('Generic on file {} starts at {}'.format(file_path , time.time()))

Answer 4

我必须删除 python 项目的

.venv

（虚拟环境）文件，并通过运行命令

.venv

创建一个新的

virtualenv .venv

来解决问题。