如何使用脚本将标准输出重定向到文件和控制台? [英] How to redirect stdout to both file and console with scripting?

问题描述

我想运行一个 python 脚本并将输出捕获到一个文本文件中，并想在控制台上显示.

I want to run a python script and capture the output on a text file as well as want to show on console.

我想将它指定为 python 脚本本身的一个属性.不要使用命令 echo "hello world" |tee test.txt 每次都在命令提示符下.

I want to specify it as a property of the python script itself. NOT to use the command echo "hello world" | tee test.txt on command prompt every time.

在我尝试过的脚本中:

sys.stdout = open('log.txt','w')

但这不会在屏幕上显示标准输出.

But this does not show the stdout output on screen.

我听说过日志模块，但我无法使用该模块来完成这项工作.

I have heard about logging module but I could not get luck using that module to do the job.

推荐答案

你可以在执行python文件时使用shell重定向:

You can use shell redirection while executing the python file:

python foo_bar.py > file

这会将所有打印在标准输出上的结果从 python 源写入文件到日志文件.

This will write all results being printed on stdout from the python source to file to the logfile.

或者如果您想从脚本中进行日志记录:

Or if you want logging from within the script:

import sys

class Logger(object):
    def __init__(self):
        self.terminal = sys.stdout
        self.log = open("logfile.log", "a")

    def write(self, message):
        self.terminal.write(message)
        self.log.write(message)  

    def flush(self):
        #this flush method is needed for python 3 compatibility.
        #this handles the flush command by doing nothing.
        #you might want to specify some extra behavior here.
        pass    

sys.stdout = Logger()

现在您可以使用:

print "Hello"

这会将Hello"写入标准输出和日志文件

This will write "Hello" to both stdout and the logfile

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