如下所示：
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import logging # 创建一个logger logger = logging.getLogger('mylogger') logger.setLevel(logging.DEBUG) # 创建一个handler，用于写入日志文件 fh = logging.FileHandler('test.log') fh.setLevel(logging.DEBUG) # 再创建一个handler，用于输出到控制台 ch = logging.StreamHandler() ch.setLevel(logging.DEBUG) # 定义handler的输出格式 formatter = logging.Formatter('[%(asctime)s][%(thread)d][%(filename)s][line: %(lineno)d][%(levelname)s] ## %(message)s')fh.setFormatter(formatter) ch.setFormatter(formatter) # 给logger添加handler logger.addHandler(fh) logger.addHandler(ch) # 记录一条日志 logger.info('foorbar') |
关于formatter的配置，采用的是%(<dict key>)s的形式，就是字典的关键字替换。提供的关键字包括：
| Format | Description |
|---|---|
| %(name)s | Name of the logger (logging channel). |
| %(levelno)s | Numeric logging level for the message (DEBUG, INFO, WARNING, ERROR, CRITICAL). |
| %(levelname)s | Text logging level for the message ('DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'). |
| %(pathname)s | Full pathname of the source file where the logging call was issued (if available). |
| %(filename)s | Filename portion of pathname. |
| %(module)s | Module (name portion of filename). |
| %(funcName)s | Name of function containing the logging call. |
| %(lineno)d | Source line number where the logging call was issued (if available). |
| %(created)f | Time when the LogRecord was created (as returned by time.time()). |
| %(relativeCreated)d | Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded. |
| %(asctime)s | Human-readable time when the LogRecord was created. By default this is of the form “2003-07-08 16:49:45,896” (the numbers after the comma are millisecond portion of the time). |
| %(msecs)d | Millisecond portion of the time when the LogRecord was created. |
| %(thread)d | Thread ID (if available). |
| %(threadName)s | Thread name (if available). |
| %(process)d | Process ID (if available). |
| %(message)s | The logged message, computed as msg % args. |
以上这篇python 通过logging写入日志到文件和控制台的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/shjh369/article/details/50585505
