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
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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 realstderr
.
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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