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小編給大家分享一下python如何通過logging寫入日志到文件和控制臺，希望大家閱讀完這篇文章之后都有所收獲，下面讓我們一起去探討吧！
如下所示：
import logging
# 創建一個logger
logger = logging.getLogger('mylogger')
logger.setLevel(logging.DEBUG)
# 創建一個handler，用于寫入日志文件
fh = logging.FileHandler('test.log')
fh.setLevel(logging.DEBUG)
# 再創建一個handler，用于輸出到控制臺
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
# 定義handler的輸出格式
formatter = logging.Formatter('[%(asctime)s][%(thread)d][%(filename)s][line: %(lineno)d][%(levelname)s] ## %(message)s')
fh.setFormatter(formatter)
ch.setFormatter(formatter)
# 給logger添加handler
logger.addHandler(fh)
logger.addHandler(ch)
# 記錄一條日志
logger.info('foorbar')關于formatter的配置，采用的是%(<dict key>)s的形式，就是字典的關鍵字替換。提供的關鍵字包括：
| 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. |
看完了這篇文章，相信你對“python如何通過logging寫入日志到文件和控制臺”有了一定的了解，如果想了解更多相關知識，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！
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