使用活动标准输出(退格/更新)将Python标准输出记录到文件... [英] Logging Python stdout to File... with active stdout (backspacing/updating)

问题描述

好，所以使用此示例，我将标准输出记录到文件中并将其发送到终端.

Ok, so using this example, I'm logging my stdout to a file as well as sending it to the terminal.

但是当我查看日志文件时，不处理退格键，而是将其与输出一起打印.

But when I look at the log file, the backspaces are not processed, but printed along with the output.

以任何方式可以记录python脚本的stdout的最终"状态吗?

Any way I could log the "final" state of stdout of a python script?

推荐答案

以下是从您链接的答案中获取基本类并为\r和\b添加一些正则表达式处理的解决方案:

Here is a solution that takes the basic class from the answer you linked and adds some regex handling for \r and \b:

import sys
import re

class Logger(object):
    def __init__(self, filename="Default.log"):
        self.terminal = sys.stdout
        self.log = open(filename, "a")
        self.cr_pattern = re.compile("^.*\r", re.M)
        self.bs_pattern = re.compile(".\b")

    def write(self, message):
        self.terminal.write(message)
        message = self.bs_pattern.sub('', self.cr_pattern.sub('', message))
        self.log.write(message)

sys.stdout = Logger("yourlogfilename.txt")
print "Hello\rGoodbyee\b world!"

示例运行:

$ python test.py
Goodbye world!
$ cat yourlogfilename.txt
Goodbye world!

请注意，通常您应将原始字符串文字用于正则表达式，这是不应该使用的罕见情况之一.

Note that normally you should use raw string literals for your regular expressions, this is one of the rare cases where you shouldn't.

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