如何在Python中禁用标准错误流的日志记录?这行不通:
import logging
logger = logging.getLogger()
logger.removeHandler(sys.stderr)
logger.warning('foobar') # emits 'foobar' on sys.stderr
当前回答
import logging
log_file = 'test.log'
info_format = '%(asctime)s - %(levelname)s - %(message)s'
logging.config.dictConfig({
'version': 1,
'disable_existing_loggers': False,
'formatters': {
'info_format': {
'format': info_format
},
},
'handlers': {
'console': {
'level': 'INFO',
'class': 'logging.StreamHandler',
'formatter': 'info_format'
},
'info_log_file': {
'class': 'logging.handlers.RotatingFileHandler',
'level': 'INFO',
'filename': log_file,
'formatter': 'info_format'
}
},
'loggers': {
'': {
'handlers': [
'console',
'info_log_file'
],
'level': 'INFO'
}
}
})
class A:
def __init__(self):
logging.info('object created of class A')
self.logger = logging.getLogger()
self.console_handler = None
def say(self, word):
logging.info('A object says: {}'.format(word))
def disable_console_log(self):
if self.console_handler is not None:
# Console log has already been disabled
return
for handler in self.logger.handlers:
if type(handler) is logging.StreamHandler:
self.console_handler = handler
self.logger.removeHandler(handler)
def enable_console_log(self):
if self.console_handler is None:
# Console log has already been enabled
return
self.logger.addHandler(self.console_handler)
self.console_handler = None
if __name__ == '__main__':
a = A()
a.say('111')
a.disable_console_log()
a.say('222')
a.enable_console_log()
a.say('333')
控制台输出:
2018-09-15 15:22:23,354 - INFO - object created of class A
2018-09-15 15:22:23,356 - INFO - A object says: 111
2018-09-15 15:22:23,358 - INFO - A object says: 333
Test.log文件内容:
2018-09-15 15:22:23,354 - INFO - object created of class A
2018-09-15 15:22:23,356 - INFO - A object says: 111
2018-09-15 15:22:23,357 - INFO - A object says: 222
2018-09-15 15:22:23,358 - INFO - A object says: 333
其他回答
您可以更改特定处理程序的调试模式级别，而不是完全禁用它。
因此，如果你有一个情况，你想停止调试模式的控制台，但你仍然需要保持其他级别，如错误。你可以像下面这样做
# create logger
logger = logging.getLogger(__name__)
def enableConsoleDebug (debug = False):
#Set level to logging.DEBUG to see CRITICAL, ERROR, WARNING, INFO and DEBUG statements
#Set level to logging.ERROR to see the CRITICAL & ERROR statements only
logger.setLevel(logging.DEBUG)
debugLevel = logging.ERROR
if debug:
debugLevel = logging.DEBUG
for handler in logger.handlers:
if type(handler) is logging.StreamHandler:
handler.setLevel (debugLevel)
子类化你想要暂时禁用的处理程序:
class ToggledHandler(logging.StreamHandler):
"""A handler one can turn on and off"""
def __init__(self, args, kwargs):
super(ToggledHandler, self).__init__(*args, **kwargs)
self.enabled = True # enabled by default
def enable(self):
"""enables"""
self.enabled = True
def disable(self):
"""disables"""
self.enabled = False
def emit(self, record):
"""emits, if enabled"""
if self.enabled:
# this is taken from the super's emit, implement your own
try:
msg = self.format(record)
stream = self.stream
stream.write(msg)
stream.write(self.terminator)
self.flush()
except Exception:
self.handleError(record)
通过名称查找处理程序非常简单:
_handler = [x for x in logging.getLogger('').handlers if x.name == your_handler_name]
if len(_handler) == 1:
_handler = _handler[0]
else:
raise Exception('Expected one handler but found {}'.format(len(_handler))
一旦发现:
_handler.disable()
doStuff()
_handler.enable()
这不是100%的解决方案，但这里没有一个答案解决了我的问题。我有自定义的日志模块，根据严重程度输出彩色文本。我需要禁用stdout输出，因为它复制了我的日志。我对将关键日志输出到控制台很满意，因为我几乎不使用它。我没有测试它是否为stderr，因为我没有在日志中使用它，但它应该与stdout的工作方式相同。它将CRITICAL设置为仅针对stdout的最小严重程度(如果请求则为stderr)。
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
# disable terminal output - it is handled by this module
stdout_handler = logging.StreamHandler(sys.stdout)
# set terminal output to critical only - won't output lower levels
stdout_handler.setLevel(logging.CRITICAL)
# add adjusted stream handler
logger.addHandler(stdout_handler)
我找到了一个解决方案:
logger = logging.getLogger('my-logger')
logger.propagate = False
# now if you use logger it will not log to console.
这将防止日志被发送到包含控制台日志的上层记录器。
import logging
log_file = 'test.log'
info_format = '%(asctime)s - %(levelname)s - %(message)s'
logging.config.dictConfig({
'version': 1,
'disable_existing_loggers': False,
'formatters': {
'info_format': {
'format': info_format
},
},
'handlers': {
'console': {
'level': 'INFO',
'class': 'logging.StreamHandler',
'formatter': 'info_format'
},
'info_log_file': {
'class': 'logging.handlers.RotatingFileHandler',
'level': 'INFO',
'filename': log_file,
'formatter': 'info_format'
}
},
'loggers': {
'': {
'handlers': [
'console',
'info_log_file'
],
'level': 'INFO'
}
}
})
class A:
def __init__(self):
logging.info('object created of class A')
self.logger = logging.getLogger()
self.console_handler = None
def say(self, word):
logging.info('A object says: {}'.format(word))
def disable_console_log(self):
if self.console_handler is not None:
# Console log has already been disabled
return
for handler in self.logger.handlers:
if type(handler) is logging.StreamHandler:
self.console_handler = handler
self.logger.removeHandler(handler)
def enable_console_log(self):
if self.console_handler is None:
# Console log has already been enabled
return
self.logger.addHandler(self.console_handler)
self.console_handler = None
if __name__ == '__main__':
a = A()
a.say('111')
a.disable_console_log()
a.say('222')
a.enable_console_log()
a.say('333')
控制台输出:
2018-09-15 15:22:23,354 - INFO - object created of class A
2018-09-15 15:22:23,356 - INFO - A object says: 111
2018-09-15 15:22:23,358 - INFO - A object says: 333
Test.log文件内容:
2018-09-15 15:22:23,354 - INFO - object created of class A
2018-09-15 15:22:23,356 - INFO - A object says: 111
2018-09-15 15:22:23,357 - INFO - A object says: 222
2018-09-15 15:22:23,358 - INFO - A object says: 333
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