logging.streamhandler
时间: 2023-04-23 10:07:13 浏览: 152
logging.streamhandler是Python中的一个日志处理器,用于将日志输出到流(例如控制台或文件)。它可以将日志消息格式化并写入流中,以便于调试和记录应用程序的运行状态。使用logging.streamhandler可以方便地控制日志输出的位置和格式。
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logging.StreamHandler
`logging.StreamHandler` is a class in the Python `logging` module that sends logging output to a stream (e.g. `sys.stdout`, `sys.stderr`, or a file-like object). It can be used to configure logging to send output to the console or to a file.
Here's an example of how to use it:
```python
import logging
# Create a logger
logger = logging.getLogger('example_logger')
logger.setLevel(logging.DEBUG)
# Create a stream handler and set its logging level to INFO
stream_handler = logging.StreamHandler()
stream_handler.setLevel(logging.INFO)
# Add the stream handler to the logger
logger.addHandler(stream_handler)
# Log some messages
logger.debug('Debug message')
logger.info('Info message')
logger.warning('Warning message')
logger.error('Error message')
logger.critical('Critical message')
```
In this example, `logging.StreamHandler` is used to send logging output to the console. The `logger` object is created with a name of `'example_logger'` and its logging level is set to `DEBUG`. A stream handler is created with a logging level of `INFO`, which means that it will only handle messages with a severity level of `INFO` or higher. The stream handler is added to the logger, and then several messages are logged at different severity levels. Since the logger's logging level is set to `DEBUG`, all messages are processed by the logger and sent to the stream handler. The stream handler only outputs messages with a severity level of `INFO` or higher, so only the `INFO`, `WARNING`, `ERROR`, and `CRITICAL` messages are displayed on the console.
logging.StreamHandler()
`logging.StreamHandler()`是Python标准库中的一个日志处理器,它将日志消息发送到一个文件流(默认情况下是标准输出流)。它的作用是将日志消息输出到控制台或其他标准输出流,用于调试和记录应用程序的运行状态。可以使用`logging.getLogger().addHandler()`方法将其添加到logger对象中,以便将日志消息发送到指定的处理器。例如:
```python
import logging
logger = logging.getLogger()
handler = logging.StreamHandler()
logger.addHandler(handler)
logger.info('This is an info message')
logger.error('This is an error message')
```
这段代码将会将日志消息输出到控制台。在控制台上将会看到:
```
This is an info message
This is an error message
```