将 stdout、stderror 重定向到文件，而 stderr 仍然打印到屏幕 [英] Redirecting stdout, stderror to file while stderr still prints to screen

问题描述

我希望 stdout 和 stderr 被重定向到同一个文件，而 stderr 仍然写入屏幕.执行此操作的最 Pythonic 方法是什么?

I would like stdout and stderr to be redirected to the same file, while stderr still writes to the screen. What's the most pythonic way to do this?

推荐答案

我假设您想重定向当前脚本的 stdout 和 stderr，而不是您正在运行的某个子进程.

I'm assuming you want to redirect the current script's stdout and stderr, not some subprocess you're running.

这听起来不像是一件非常 Pythonic 的事情，但如果您需要，Pythonic 解决方案将是:

This doesn't sound like a very Pythonic thing to do in the first place, but if you need to, the Pythonic solution would be:

• 将 stdout 重定向到一个文件.
• 将 stderr 重定向到一个自定义的类文件对象，该对象写入文件并写入真正的 stderr.

• Redirect stdout to a file.
• Redirect stderr to a custom file-like object that writes to the file and also writes to the real stderr.

像这样:

class Tee(object):
    def __init__(self, f1, f2):
        self.f1, self.f2 = f1, f2
    def write(self, msg):
        self.f1.write(msg)
        self.f2.write(msg)

outfile = open('outfile', 'w')

sys.stdout = outfile
sys.stderr = Tee(sys.stderr, outfile)

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