subprocess.run 不抑制所有控制台输出

Question

subprocess.run 与 stdout=DEVNULL 和 stderr=STDOUT 不会抑制 subinacl.exe 实用程序的所有输出。

>>> # Do not suppress: OK
>>> subprocess.run('subinacl.exe /service "foo" display', shell=True)
foo - OpenService Error : 1060 The specified service does not exist as an installed service.



Elapsed Time: 00 00:00:00
Done:        1, Modified        0, Failed        1, Syntax errors        0
Last Done  : foo
Last Failed: foo - OpenService Error : 1060 The specified service does not exist as an installed service.

CompletedProcess(args='subinacl.exe /service "foo" display', returncode=0)

>>> # Suppress: Some output is still printed
>>> subprocess.run('subinacl.exe /service "foo" display', shell=True, stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT)

Elapsed Time: 00 00:00:00
Done:        1, Modified        0, Failed        1, Syntax errors        0
Last Done  : foo
Last Failed: foo - OpenService Error : 1060 The specified service does not exist as an installed service.

CompletedProcess(args='subinacl.exe /service "foo" display', returncode=0)
>>>

我的猜测是 subinacl.exe 正在调用另一个打印未被抑制的输出的进程。 stdout=DEVNULL 和 stderr=STDOUT 不会从整个流程链中静音输出吗？

Answer 1

根据 Eryk Sun 的评论，我不得不使用

subprocess.run(
    'subinacl.exe /service "foo" display',
    stdout=subprocess.DEVNULL,
    stderr=subprocess.STDOUT, 
    creationflags=subprocess.CREATE_NO_WINDOW
)

subprocess.run 不抑制所有控制台输出

subprocess.run not suppressing all console output

python

windows

subprocess

python-3.7

console-output