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76 lines
1.3 KiB
Markdown
76 lines
1.3 KiB
Markdown
# logging 模块：记录日志
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`logging` 模块可以用来记录日志：
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In [1]:
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```py
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import logging
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```
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`logging` 的日志类型有以下几种：
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* `logging.critical(msg)`
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* `logging.error(msg)`
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* `logging.warning(msg)`
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* `logging.info(msg)`
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* `logging.debug(msg)`
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级别排序为：`CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET`
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默认情况下，`logging` 的日志级别为 `WARNING`，只有不低于 `WARNING` 级别的日志才会显示在命令行。
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In [2]:
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```py
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logging.critical('This is critical message')
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logging.error('This is error message')
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logging.warning('This is warning message')
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# 不会显示
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logging.info('This is info message')
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logging.debug('This is debug message')
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```
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```py
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CRITICAL:root:This is critical message
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ERROR:root:This is error message
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WARNING:root:This is warning message
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```
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可以这样修改默认的日志级别：
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In [3]:
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```py
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logging.root.setLevel(level=logging.INFO)
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logging.info('This is info message')
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```
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```py
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INFO:root:This is info message
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```
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可以通过 `logging.basicConfig()` 函数来改变默认的日志显示方式：
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In [4]:
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```py
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logging.basicConfig(format='%(asctime)s: %(levelname)s: %(message)s')
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logger = logging.getLogger("this program")
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logger.critical('This is critical message')
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```
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```py
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CRITICAL:this program:This is critical message
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``` |