python logging.StreamHandler()的包装输出
作者:互联网
我使用多个处理程序
rootLogger = logging.getLogger()
rootLogger.basicConfig(filename = logfile, level=logging.INFO)
consLogger = logging.StreamHandler()
consLogger.setFormatter(logging.Formatter('%(asctime)-8s %(levelname)-8s %(message)s', '%H:%M:%S'))
consLogger.setLevel(logging.DEBUG)
rootLogger.addHandler(consLogger)
并希望consLogger(只是consLogger,而不是所有日志处理程序)正确包装和缩进,如
11:03:46 DEBUG text
11:03:47 DEBUG text again
11:03:47 DEBUG some text that is longer than current cons
ole width or at least some pre-defined lin
e length
我应该从哪里开始?
解决方法:
需要注意的是,这确实对您要保存的任何日志都有害(因为它会破坏grep或类似的逐行搜索),您可以通过textwrap模块和自定义日志记录轻松实现此目的. Formatter子类.
textwrap是一个标准的库模块,可以自动换行段落,也可以应用缩进和其他格式.所有真正需要的是通过创建一个自定义格式化程序类来覆盖它,该类覆盖format()方法(处理整个日志消息,而不是处理部分的其他一些方法):
import logging
import textwrap
class WrappedFixedIndentingLog(logging.Formatter):
def __init__(self, fmt=None, datefmt=None, style='%', width=70, indent=4):
super().__init__(fmt=fmt, datefmt=datefmt, style=style)
self.wrapper = textwrap.TextWrapper(width=width, subsequent_indent=' '*indent)
def format(self, record):
return self.wrapper.fill(super().format(record))
# standard stuff
rootLogger = logging.getLogger()
rootLogger.setLevel(logging.DEBUG)
consLogger = logging.StreamHandler()
rootLogger.addHandler(consLogger)
# indent=18 matches fixed width of asctime + levelname + spaces
consLogger.setFormatter(WrappedFixedIndentingLog(
'%(asctime)-8s %(levelname)-8s %(message)s', '%H:%M:%S', indent=18))
message = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
rootLogger.log(logging.DEBUG, message)
输出:
18:48:56 DEBUG Lorem ipsum dolor sit amet, consectetur adipisicing
elit, sed do eiusmod tempor incididunt ut labore et
dolore magna aliqua. Ut enim ad minim veniam, quis
nostrud exercitation ullamco laboris nisi ut aliquip
ex ea commodo consequat. Duis aute irure dolor in
reprehenderit in voluptate velit esse cillum dolore
eu fugiat nulla pariatur. Excepteur sint occaecat
cupidatat non proident, sunt in culpa qui officia
deserunt mollit anim id est laborum.
标签:python,logging,textwrapping 来源: https://codeday.me/bug/20190825/1715392.html