Python 3 子进程模块在运行“dir"时抛出错误在 Windows 上 [英] Python 3 subprocess module throws error running "dir" on Windows

问题描述

Python 3 中的这个简单程序会引发错误.可能是什么原因?在我安装/重新安装 Python 3.5/3.6 后出现了这个问题.另外 Python 2.7 安装在我的电脑(Windows 10 机器)上.

This simple program in Python 3 throws errors. What could be the reason? This problem arose after I installed/reinstalled Python 3.5/3.6. Also Python 2.7 is installed on my PC (windows 10 machine).

import subprocess 
out = subprocess.check_output(['dir'])

错误信息:

文件C:\Python36\lib\subprocess.py"，第 336 行，在 check_output 中**kwargs).stdout

File "C:\Python36\lib\subprocess.py", line 336, in check_output **kwargs).stdout

文件C:\Python36\lib\subprocess.py"，第 403 行，运行中以 Popen(*popenargs, **kwargs) 作为进程:

File "C:\Python36\lib\subprocess.py", line 403, in run with Popen(*popenargs, **kwargs) as process:

文件C:\Python36\lib\subprocess.py"，第 707 行，initrestore_signals, start_new_session)

File "C:\Python36\lib\subprocess.py", line 707, in init restore_signals, start_new_session)

文件C:\Python36\lib\subprocess.py"，第 990 行，在 _execute_child启动信息)

File "C:\Python36\lib\subprocess.py", line 990, in _execute_child startupinfo)

FileNotFoundError: [WinError 2] 系统找不到文件指定

FileNotFoundError: [WinError 2] The system cannot find the file specified

推荐答案

它不是可执行文件，而是 内置到外壳.Python subprocess 模块找不到它，所以你得到了一个错误.

It's not an executable, but built-in to the shell. Python subprocess module can't find it, so you got an error.

如果您想使用子进程模块，请使用一些现有的二进制文件，例如python、notepad 或 ping.如果您需要列出文件夹内容，请使用 os.listdir 或 os.walk.

If you would like to play with subprocess module, use some existing binary, e.g. python, notepad or ping. In case you need to list folder content, please use os.listdir or os.walk.

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