python3 日志重复打印logger

在python2中正常的日志，单只直接使用python3,发现日志重复了，其实是handlers多添加的原因，

python2代码

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def my_log(msg):

if logging.getLogger('log.log'):

return logging.getLogger('log.log')

logger = logging.getLogger('log.log')

ch = logging.StreamHandler()

ch.setLevel(logging.ERROR)

fmt = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')

ch.setFormatter(fmt)

logger.addHandler(ch) logger.error(msg)

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适当修改一下：

python3代码：
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def my_log(msg):

if logging.getLogger('log.log'):

return logging.getLogger('log.log')

logger = logging.getLogger('log.log')

if  not logger.handlers:

ch = logging.StreamHandler()

ch.setLevel(logging.ERROR)

fmt = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')

ch.setFormatter(fmt)

logger.addHandler(ch) logger.error(msg)
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加一个重复判断就行