如何重定向第三方 python 库使用 os.system 运行的程序的 stderr

发布于 2024-11-09 06:50:48 字数 494 浏览 4 评论 0原文

我使用外部库，如下所示：

from some_lib import runThatProgram

infile = '/tmp/test'
outfile = '/tmp/testout'
runThatProgram(infile, outfile)

while runThatProgram is:

def runThatProgram(infile, outfile):
    os.system("%s %s > %s" % ('thatProgram', infile, outfile))

问题是 'thatProgram' 在 STDERR 上返回很多内容，我想将其重定向到一个文件，但我无法编辑< /strong> runThatProgram code 因为它位于第三方库中！

原文

I use external library, like this:

from some_lib import runThatProgram

infile = '/tmp/test'
outfile = '/tmp/testout'
runThatProgram(infile, outfile)

while runThatProgram is:

def runThatProgram(infile, outfile):
    os.system("%s %s > %s" % ('thatProgram', infile, outfile))

The problem is that 'thatProgram' returns lots of stuff on STDERR, I want to redirect it to a file, but I cannot edit runThatProgram code because it is in third party lib!

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优雅的叶子 2024-11-16 06:50:48

为了说明 Rosh Oxymoron 所说的内容，您可以像这样破解代码：

from some_lib import runThatProgram

infile = '/tmp/test'
outfile = '/tmp/testout 2>&1'
runThatProgram(infile, outfile)

这样，它将调用

thatProgram /tmp/test > /tmp/testout 2>&1

将 stderr (2) 重定向到 stdout (1)，并且所有内容都将记录在您的输出文件中。

To illustrate what Rosh Oxymoron said, you can hack the code like this :

from some_lib import runThatProgram

infile = '/tmp/test'
outfile = '/tmp/testout 2>&1'
runThatProgram(infile, outfile)

with this, it will call

thatProgram /tmp/test > /tmp/testout 2>&1

that will redirected stderr (2) to stdout (1), and everything will be logged in your outfile.

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很酷又爱笑 2024-11-16 06:50:48

要详细说明如何使用 subprocess，您可以打开它，给它一个管道，然后从那里所以

import subprocess
program = "runthatprogram.py".split()
process = subprocess.Popen(program, stdout = subprocess.PIPE, stderr = open('stderr','w')) #stderr to fileobj
process.communicate()[0] #display stdout

To elaborate on using subprocess, you can open it, give it a pipe and then work from there so

import subprocess
program = "runthatprogram.py".split()
process = subprocess.Popen(program, stdout = subprocess.PIPE, stderr = open('stderr','w')) #stderr to fileobj
process.communicate()[0] #display stdout

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